Oil Change Dos & Don’ts

Changing the motor oil on a classic car is a fundamental maintenance task that helps ensure long engine life and performance. Classic cars may have different engine designs compared to modern vehicles, so care must be taken with proper tools, correct oil type, and vintage-specific parts. We join Mark Simpson in the shop to change the oil on a ’57 DeSoto, and of course sometimes things don’t always go as planned. Here’s a step-by-step guide to the process:

Tools & Materials Needed:

- Jack and jack stands or ramps (if clearance is low)
- Oil drain pan
- Wrench or socket set
- Oil filter wrench
- Funnel
- Rags or paper towels
- Fresh Motor Oil (Consult your manual for type and capacity)
- New oil filter (specific to your car)
- Rubber gloves (recommended)
- Safety glasses

Step-by-Step Process:

1. Warm Up the Engine
- Run the engine for 5–10 minutes. Warm oil drains more thoroughly.
- Turn off the engine and ensure the car is on a flat surface.

2. Raise the Vehicle (if needed)
- Use a jack and secure with jack stands or drive up on ramps.
- Ensure it's stable before working underneath.

3. Drain the Old Oil
- Place the drain pan under the oil pan’s drain plug.
- Use a wrench to carefully remove the plug.
- Let the oil drain fully (this may take a few minutes).
- Inspect the drain plug gasket—replace if damaged or worn.

4. Remove the Oil Filter
- Use an oil filter wrench if needed.
- Be careful—some oil may spill.
- Clean the filter mounting surface with a rag and inspect closely to ensure the old rubber gasket did not remain stuck to the engine block.

5. Install the New Filter
- Apply a thin coat of fresh oil to the rubber gasket on the new filter.
- Hand-tighten the new filter; do not over-tighten.

6. Replace the Drain Plug
-Once all the oil has drained, reinstall and tighten the drain plug securely but not excessively.

7. Add New Oil
- Open the oil filler cap on the engine.
- Insert a funnel and pour in the recommended amount and type of oil.
- Replace the cap.

8. Check the Oil Level
- Start the engine and let it run for 1–2 minutes.
- Turn off the engine and wait a minute.
- Pull the dipstick, wipe it clean, reinsert it, and check the level.
- Add oil if necessary.

9. Check for Leaks
- Inspect around the oil filter and drain plug for any signs of leaking.

10. Dispose of Old Oil Properly
- Take the used oil and filter to a recycling center or auto parts store that accepts oil waste.

Classic Car Considerations:

- Older engines may benefit from high-zinc oil (like ZDDP additives) to protect flat-tappet cams.
- Gaskets and threads on classic engines can be delicate—avoid overtightening.
- Some classics may use copper washers on the drain plug; inspect and replace if crushed or damaged.
- Change the oil every 3,000 miles or annually if the car isn’t driven much.

Changing your motor oil regularly is the one way to guarantee your engine delivers years of great service and peace of mind in protecting you classic car investment.