To remove it:
1. Prepare: Warm up the engine for a few minutes to thin the oil. This makes draining easier and prevents the oil from being too thick to remove the filter. Then, turn off the engine and let it sit for 10-15 minutes to allow some of the oil to drain back into the pan. Wear gloves to protect your hands and have a drain pan ready to catch the old oil. You'll also need a wrench that fits your oil filter – usually a cap-type wrench, or an adjustable wrench in a pinch. Some filters can be removed by hand, though you might need to use a strap wrench if your hands aren't strong enough or the filter is really tight.
2. Locate the filter: Carefully inspect the passenger side of the engine block. Look for a cylindrical canister that looks different from the other components; it's likely the oil filter.
3. Position the wrench: Place the wrench securely onto the filter. If using a strap wrench, carefully tighten the strap around the filter.
4. Unscrew the filter: Turn the wrench counterclockwise to loosen and remove the oil filter. Be prepared for some oil to spill; that's why the drain pan is essential. The filter will likely be somewhat tight. If it's extremely difficult, try using a filter wrench with a better grip or a longer handle for more leverage.
5. Dispose of the old filter: Dispose of the used oil filter properly. Many auto parts stores will recycle them. Never throw used oil filters in the regular trash.
6. Install the new filter: Before installing the new oil filter, lightly lubricate the rubber gasket on the new filter with fresh oil. Screw the new filter on by hand until it's snug. Then, tighten it an additional ¾ to 1 full turn. Don't overtighten it; it can damage the filter or engine.
Important Note: While this describes the general location and procedure, the exact location and accessibility may vary slightly depending on the specific engine and any modifications to the car. A picture or a repair manual specific to your 1990 Buick Skylark 4-cylinder would be helpful for precise location confirmation. Consult a repair manual for detailed instructions and diagrams specific to your vehicle. If you are uncomfortable performing this task yourself, take your car to a qualified mechanic.
