How often should I change engine oil?

Most modern engines: every 10,000 miles or 12 months. Short-trip drivers and turbo diesels: every 6,000 miles or 6 months for longer engine life.

Here's a quick, honest answer from a working UK mechanic — what causes it, what it costs to fix, and what to do next.

Can I extend the interval if I do low miles? — No — oil ages chemically as well as mechanically. 12 months is the maximum for any modern engine.

Will a missed oil change show up? — Yes — engine wear is permanent and timing chain damage on chain-driven engines often traces to extended intervals.

Bob's Mechanical Repairs — independent family-run garage in Birnam, Dunkeld, Perthshire. Call 01350 727 276 or email [email protected].