Engine oil lubricates moving parts, carries away heat, and traps contaminants. The filter catches metal shavings and sludge. Both wear out and need replacing on a schedule.
Why It Matters
Old oil thickens, loses its ability to protect, and can cause sludge buildup. Skipping changes is the fastest way to wreck an engine.
How to Save Money on Oil and Filter Change
Conventional oil is fine for most older cars, only newer engines actually require full synthetic
Buy oil and filter at a parts store on sale, hand them to the shop and pay labor only
Independent shops often charge half what dealers do for the same service
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