What’s the longest you’ve gone without changing your engine oil?

With full synthetic you could probably go 20000 in most modern engines

Longest i've gone was 6000 but I use a full synthetic so honestly I could probably go to 8000-9000. Not willing to risk that though

50,000 with Amsoil and a bypass filter. I now run Mobil1 and 10,000 normally. I put mostly highway miles around 40,000 a year.

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weekend vehicle

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Subtle brag

11 years but I don't drive it much.

I went 10+k in an accord during college...

Not recommended.

My last oil change on my '03 Tundra was in Feb. '17. Have only put about 3,000 miles on it since. I did have a battery go completely dead about two winters ago from lack of usage, that's according to my car guy at the dealership. But to answer your question, every 5,000 with tire rotation. Sometimes I think that is more important than the oil change.

I just went a year without changing the oil in my truck. Only put a little over 3k on it in that period though.

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frick spending $50 bucks every 3 months to extent the working life of a $30-40K piece of machinery.

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I get what you're saying here but if you use synthetic and don't drive your engine ridiculously hard, 5,000 miles between oil changes is perfectly acceptable.

Point is there's no one size fits all answer. Do what the owner's manual says, and use common sense. The shop says 3 months or 3,000 miles because that's a pretty good interval to have a car at least laid eyes on by a mechanic for the average owner who knows jack shite about their vehicle. If you're not the average owner then do whatever you're comfortable doing.