Comprehensive Auto Repair and Oil Change Notes
Ethical Practices in Auto Repair Service
Importance of Honesty: Do not 'be a dirtbag' by selling customers things they don't truly need. Honesty builds trust and is essential for repeat business and customer confidence.
Proving the Problem: Always show the customer what is wrong with their vehicle, how you found the problem, and physically demonstrate the issue. This transparency helps customers understand and trust the repair process.
Impact of Trust: Customers gain confidence when a mechanic proves the need for a repair. This leads to them trusting the mechanic and recommending them to others, resulting in referrals like, "Ask for this person when you go there."
Recognizing Unethical Practices: Beware of workplaces that encourage 'creative selling', which can mean lying to customers or upselling unnecessary services. The example of a manager asking for 'creativity' in selling repairs that 'could be bad in a few months' illustrates this.
Misdiagnosis Example (Wheel Bearing vs. Tire): A vehicle was initially diagnosed by the owner as needing a wheel bearing due to a growling noise. The mechanic, verifying the issue themselves, discovered it was actually a tire problem. Replacing the tire saved the customer 300 ext{ to } $400 and fixed the issue. The owner's negative reaction to this honest diagnosis highlights the pressure to upsell.
Personal Integrity: The speaker quit a job over unethical sales practices, emphasizing that needing money does not justify dishonesty. Being a 'dirtbag' makes one complicit in a bad system.
Effective Selling through Honesty: You can still sell services effectively by being honest and showing the customer what is truly needed. Customers are more likely to approve repairs when they see the proof, rather than just taking a service writer's word for it.
Proactive Vehicle Inspections During Oil Changes
Purpose of Inspection: An oil change is an opportunity to inspect the vehicle for the customer. This helps identify small problems before they become major issues, generates honest revenue, and educates the customer about their vehicle's condition.
Fluid Checks:
Comprehensive Fluid Check: Check every fluid under the hood, especially oil.
Low Fluid Responsibility: If a car has very little oil (e.g., quarts instead of ), it has likely sustained significant engine damage. Documenting this protects the mechanic from liability if the engine fails soon after an oil change.
Overdue Oil Changes: Note if a vehicle is significantly overdue (e.g., or even past due as seen in an extreme case). This covers the mechanic if engine issues arise soon after the overdue oil change.
Automatic Transmission Fluid: Always check with the vehicle running. Newer cars, especially Mopars, may not have readily available dipsticks, requiring special tools (e.g., measuring to for ProMasters, for Rams) or professional procedures. Inspect fluid for appearance and burnt smell.
Manual Transmission & Differential Gear Oil: Check by removing the fill plug. Fluid should be at the bottom of the hole or just starting to trickle out. If not, fill until it trckles out.
Coolant:
Safety First: NEVER open a hot, pressurized cooling system. The system operates at high temperatures (e.g., ) without boiling due to pressure. Opening it rapidly releases pressure and causes violent boiling/eruption. For every of pressure increase, the boiling point of the liquid rises by .
Checking Levels: Observe the clear reservoir bottle. If it's empty, then you can open and fill after the engine has cooled.
Closed System Implication: If coolant is missing, there is a leak somewhere that needs to be found.
Coolant Wear: Coolant wears out over time. It provides critical functions: heat transfer, lubrication for internal components (aluminum, steel, rubber), rust prevention, and freeze/boiling protection.
Mixture Ratios: Best freeze protection is 70 ext{%} coolant / 30 ext{%} water (down to ). A common 50 ext{%} coolant / 50 ext{%} water mixture protects down to about .
Cost Savings: Buy full-strength coolant concentrate and mix it yourself; it yields two gallons for the price of one pre-diluted gallon. Shop for fluids at unexpected places (Walmart, hardware stores) for better prices.
Testing & Education: Use test strips to prove coolant wear to customers. Explain that worn-out coolant loses its freeze protection (e.g., might become ). If coolant freezes, it expands, risking cracked engine blocks and cylinder heads. It also loses boiling protection.
Flushes vs. Exchanges: Coolant flush is pressurized; a coolant exchange is simple drain and fill without pressure.
Brake Fluid & Clutch Fluid: These are closed systems. If fluid is low, it indicates either a leak or worn brake pads (pistons pushed out farther, requiring more fluid). NEVER top off brake fluid if it's low due to pad wear; when new pads are installed, the pistons retract, causing an overflow. Brake fluid is highly corrosive and can damage paint. Always use the correct type of fluid. Like coolant, brake fluid wears out and can be checked with test strips, but a standalone fluid exchange is rarely sold unless the system is opened for other repairs.
Power Steering Fluid: Also a closed system. If low, it signifies a leak that needs repair. Do not top off without addressing the leak. Many modern cars have electric power steering and do not use fluid.
Washer Fluid: Typically topped off as a courtesy at most service centers.
Filter Checks:
Engine Air Filter: Crucial for engine performance and operation. A severely dirty filter can prevent an engine from starting. Show the dirty filter to the customer, comparing it to a new one.
Cabin Air Filter: Affects AC and heating performance. Often overlooked by customers and can be expensive. Some are difficult to access; only check for free if easily accessible (e.g., less than to reach).
Chassis Lubrication:
Grease fittings are found on suspension, drive shafts, and steering components (ball joints, tie rods, sway bar links, control arms). New vehicles don't have them from the factory, but replacement components often do. Lubricate until the rubber boot just starts to expand, avoiding over-greasing and blowing out the boot.
Service Interval Schedule: Adhere to the manufacturer's recommended service intervals found in the owner's manual or vehicle repair databases (like AllData). Intervals vary widely (e.g., for conventional oil, for synthetic, up to for some modern vehicles, though shorter intervals are sometimes preferred for personal vehicles).
General Vehicle Overlook:
Exterior Walkaround: Before bringing the vehicle into the shop, visually inspect for dents, scratches, or scuffs. Documenting these protects the shop from fraudulent claims of damage. Example: customer claiming a new dent caused by the shop when it was pre-existing.
Under the Hood: Inspect hoses, drive belts, and any exposed wiring for wear or damage.
Tires: Inspect general condition and inflation. Even with TPMS (Tire Pressure Monitoring System) which displays pressures, manual checks are necessary as TPMS lights typically activate only when pressure is significantly low (e.g., or more). Look for fluid leaks and unusual engine noises.
Detailed Oil Change Procedure
Staging the Oil Change:
Initial Assessment: As the vehicle is pulled in, check the oil change sticker in the window. Note if it's significantly overdue as a liability precaution.
Hood Open & Oil Level Check: Open the hood and check the current oil level. Note if it's too low (potential damage already done) or too high (potential contamination or overfill).
Remove Dipstick & Fill Cap: Remove the dipstick and oil fill cap to prevent a vacuum lock, which can hinder oil drainage.
Optimizing Workflow:
Pre-Drain Inspection: Perform all other inspection items (filters, fluids, chassis lubrication, etc.) before draining the oil. This allows the service adviser to communicate findings, create estimates, and get customer approval while the technician is actively working on the oil change, minimizing idle time.
Draining Oil:
Raise Vehicle: Raise the vehicle to a comfortable working height.
Remove Drain Plug: Loosen the drain plug with a wrench, then remove it quickly by hand to avoid oil spillage. If a wrench is needed for the entire removal, the drain plug should be replaced. Check the drain plug washer/seal; replace the plug if damaged or worn. Always replace used drain plugs as they are not meant to last forever.
Removing Oil Filter:
Timing: Remove the oil filter while the oil is draining.
Safety: Be cautious of hot engine parts and hot oil. Use gloves if necessary.
Spin-on Filters: Typically hand-tightened, but often require a tool (e.g., a three-prong tool is highly recommended) for removal due to over-tightening or heat cycling. CRITICAL STEP: ALWAYS remove the old O-ring gasket from the engine block. If two O-rings are present (old one stuck, new filter with its own), it will cause a catastrophic oil blowout.
Cartridge Filters: These come with new O-rings (one to three, depending on the filter) that must be replaced. These filters are commonly found in a housing that has a torque specification printed on it (e.g., ). ALWAYS use a torque wrench for cartridge filters; the first resistance felt is the O-ring crushing, not the final seating.
Installing New Oil Filter:
Lubricate O-ring: Apply a thin film of old or new oil to the new O-ring(s) to ensure proper sealing and ease of future removal.
Spin-on Filters: Screw on until the O-ring touches the mating surface, then tighten an additional one full turn by hand. Do not over-tighten, even if it feels like it could go tighter. If using a wrench due to tight space, only turn it one full turn. This instruction is typically printed on the filter itself.
Cartridge Filters: Install the new O-ring(s), lubricate with oil, and screw the housing on. Tighten to the exact torque specification printed on the housing, using a torque wrench. Do not rely on hand feel.
Installing Drain Plug:
Install the new drain plug gasket (if applicable) and thread the drain plug in by hand as far as it will go. Never use power tools.
Snug the plug with a wrench. The goal is to crush the gasket for a seal, but avoid over-tightening which can strip the oil pan threads (resulting in expensive oil pan replacement).
Refilling Oil:
Verify Specs: Crucially, determine the correct type (e.g., GM Dexos one oil) and exact quantity of oil needed. Refer to service information or manufacturer guidelines; capacities vary significantly (e.g., a 4-cylinder could take , an 8-cylinder could take ).
Oil Type Importance: Modern engines, especially GDI (Gasoline Direct Injection) with injectors spraying fuel at directly into cylinders, require specific oil formulations to prevent fuel from washing oil off cylinder walls. Incorrect oil can lead to bare spots, hot spots, pre-ignition, detonation, and engine damage. Warranty claims can be denied if the wrong oil type is used.
Oil Weight Importance: Correct viscosity (thickness) ensures oil can reach all necessary engine passages quickly. Too thick, it won't circulate fast enough; incorrect viscosity for GDI can lead to oil blow-by and increased risk of pre-ignition and low-speed pre-ignition (LSPI).
Filling Procedure: Pour in slightly less than the specified amount (e.g., for an capacity). This helps prevent overfilling. The difference between 'capacity' and 'oil change capacity' accounts for oil remaining in galleries.
Danger of Overfilling: Overfilling oil is as dangerous as having low oil. Excess oil can be whipped into foam by the spinning crankshaft, introducing air bubbles and reducing lubrication, leading to low oil pressure and engine damage. A story of a Cadillac being filled with of oil (instead of quarts) destroying the engine (a repair) illustrates this point; it took to pump that much oil.
Dipstick Reading: When checking the dipstick, aim for the middle of the 'low' and 'full' marks. Some cars (like BMWs) will register 'oil pressure too high' if filled to the absolute 'full' line, requiring some oil to be drained.
Post-Fill Checks:
Start Engine: Start the engine and allow it to run for a few seconds to build oil pressure. Initial rattling and an illuminated oil pressure light are normal temporarily, but should quickly subside.
Shut Off & Recheck: Shut off the engine, then re-check the oil level and inspect the drain plug and oil filter for leaks.
Final Steps:
Oil Change Sticker: Place an oil change sticker in the window with the recommended next service interval.
Reset Oil Life Indicator: Even if the dashboard oil life monitor shows a high percentage (e.g., 40 ext{%}), reset it to 100 ext{%}. This prevents the customer from being inconvenienced by the light coming on prematurely a month later.
Dispose of Used Oil: Dispose of used oil properly according to environmental regulations.
Understanding Motor Oil: Functions, Contaminants, Additives, and Types
Importance of Motor Oil: Motor oil is the 'lifeblood' of the engine. Regular maintenance with quality motor oil is critical for vehicle longevity and performance; 85 ext{%} of ASE certified master technicians agree.
Primary Functions of Motor Oil:
Lubricate & Protect: Prevents metal-on-metal contact, reducing friction and wear, which minimizes heat, warping, and grinding away of engine parts. This is vital for efficient engine performance.
Myth Debunked: Radiator and coolant are not the only sources of cooling. Motor oil helps reduce engine heat by as much as 20 ext{%}.
Cool: Works with the radiator and coolant to dissipate engine heat, preventing overheating and seizing.
Protect Surfaces: Guards engine surfaces against acid, water, and sludge, preventing rust and corrosion.
Keep Engine Clean: Traps contaminants (deposits, sludge, dust, dirt) and keeps them suspended in the oil, to be removed during an oil change.
Seal Gaps: Fills the microscopic gaps between pistons and cylinder walls, creating a tight seal essential for efficient combustion and power generation. Without a good seal, combustion byproducts (soot, acid) can leak past pistons and contaminate the oil, causing breakdown.
Flow at Startup: When the engine starts, oil must rapidly flow from the oil pan to critical moving parts (camshafts, lifters, pistons, crankshafts) to prevent metal-on-metal contact. Multi-viscosity oils (e.g., ) flow easily at both low (e.g., ) and high (e.g., ) temperatures, ensuring protection in various conditions. Additives also coat parts for lubrication even when cold.
Causes of Oil Contamination & Breakdown:
Combustion Byproducts: Water, acid, carbon, soot from the explosion of fuel and air.
External Factors: Dust, dirt, moisture from driving conditions.
High Temperatures: Engine operating temperatures contribute to oil breakdown.
Common Contaminants:
Sludge: A sticky mixture of fuel, oil, and water, often found on cooler engine parts.
Varnish: Hard, shiny, usually brown deposits that are difficult to remove.
Motor Oil Composition:
Base Oils (80 ext{%}$): Can be conventional petroleum-based, synthetics, or a blend of both.
Additives (20 ext{%}$): These are the chemical components that 'wear out' over time, necessitating oil changes.
Key Oil Additives:
Viscosity Index Improvers: Reduce the tendency of oil viscosity to change with temperature, providing protection across extended hot and cold temperature ranges.
Anti-Foam Agents: Reduce air bubbles/foaming created by high temperatures and moving parts, maintaining a strong oil film for wear protection and hydraulic effectiveness.
Dispersants: Special molecules that cling to dirt, soot, and other contaminants, preventing them from combining into larger, harmful deposits and keeping them suspended in the oil. Crucial for preventing low-temperature sludge.
Detergents: Keep internal engine parts clean by forming protective coatings, preventing contaminants from sticking. Also neutralize acids formed during combustion and prevent high-temperature carbon/varnish deposits.
Antioxidants: Protect the oil from thermal and chemical breakdown in harsh engine conditions.
Pour Point Depressants: Prevent the formation of large wax crystals in cold temperatures, which can cause oil to gel and hinder flow during startup.
Anti-Wear Additives: Provide a chemical layer of protection between metal surfaces under high load conditions to prevent metal-to-metal contact when the oil film is squeezed away.
Friction Modifiers: Provide a similar function to anti-wear additives by coating moving parts to reduce friction and improve fuel efficiency.
Oil Change Frequency:
General Guidance: ASE master technicians recommend changing oil every or , whichever comes first. Always change the oil filter simultaneously.
"Severe Driver" Myth: Most people don't think they are 'severe drivers,' but this definition extends beyond racing or high-mileage highway driving. A recent survey found 67 ext{%} of drivers are considered 'severe service'.
Severe Service Conditions: Include stop-and-go driving, short trips, driving in dust or sand, cold weather, extended high-speed driving, idling for extended periods, towing, rapid acceleration, heavy-duty use. Turbochargers and superchargers also constitute severe service. Follow owner's manual recommendations for severe service. Regular oil changes can improve fuel economy by up to 2 ext{%}.
Motor Oil Label Information:
SAE Viscosity Grade (e.g., ): All automakers recommend multigrade oils. The 'W' stands for 'Winter'. Optimal viscosity balances protection (higher viscosity) with power and fuel economy (lower viscosity). Always use the manufacturer-recommended viscosity.
API Classification System:
Gasoline (Spark Ignition) Engines: Categories start with 'S' (e.g., SA, SB, SC through SN). SN is the most recent (for model year vehicles). Higher API classifications can generally be used where lower ones are specified.
Diesel (Compression Ignition) Engines: Categories start with 'C' (e.g., CA through CJ4). CJ4 was introduced in and is the highest quality four-stroke diesel category.
Energy Conserving / ILSAC: Many oils carry the API certification mark (STARBURST) indicating they meet ILSAC (International Standardization and Approval Committee) requirements, a joint effort by North American and Japanese engine manufacturers for fuel economy benefits.
Choosing Motor Oil Type:
Conventional Oil: Provides good, solid year-round protection.
Synthetic Blend Oil: (e.g., Valvoline) Mixes full synthetic and conventional oil for added protection, often recommended for hauling or towing.
High Mileage Motor Oil (for ): Designed with special additives to restore engine seals (making them more elastic to prevent leaks), extra detergents to reduce deposits, and additional anti-wear additives. Addresses issues like seal hardening, increased clearances, and higher oil consumption in older engines.
Full Synthetic Oil: Offers the best protection due to higher quality base oils, providing superior high-temperature (breaks down at much higher temperatures than conventional oil's threshold) and low-temperature protection. Additives are often used at higher levels compared to conventional oils. Not just for new or high-performance engines; all engines benefit from synthetic.
Racing Oil: Specifically formulated for racing engines, requiring higher levels of anti-wear additives (like zinc and phosphorus) than modern passenger car oils, which have reduced these for emissions systems. Also formulated for horsepower and high heat.
Motor Oil Myths Debunked:
"When motor oil turns black, it's no good." Myth: Modern oils are designed to disperse soot and contaminants, so they can turn black early without being used up.
"The lowest quality synthetic oil will outperform the highest quality conventional motor oil." Myth: Performance depends on both base oil quality AND the additive package. A strong conventional oil with good additives can outperform a weak synthetic.
"High mileage motor oils are no different than other oils." Myth: Quality high mileage oils are specifically formulated with extra additives (seal conditioners, detergents, anti-wear) and higher quality base oils to address the specific needs of older engines.
"Thicker oils or heavier viscosities provide better protection than thinner oils." Myth: Use the manufacturer-recommended viscosity. Too thick an oil can make the engine work harder, consume more fuel, generate more heat, and cause greater strain. Too thin an oil can reduce protection.
"You can't switch from conventional to synthetic motor oil or vice versa." Myth: Modern synthetic base oils are fully compatible with conventional oils, making it safe to switch for improved protection.