[Biggd]

Usually the only reason to test oil is for an insurance company or an auto manufacturer to have legal standing for getting out of paying for an engine failure under warrantee.

Originally Posted by thinkxingu

Is the interval the only thing you would've changed with the testing results? I mean, how many vehicles/machines fail because of oil quality? Other than running dry or overfilling, I'm not sure I've ever even heard of it happening.

I've only been driving and using machines for 27 years, but I'd be surprised if outside of racing/incredibly high tolerance engines, oil doesn't matter much beyond proper amount, viscosity, cleanliness, and interval.

I suppose if one is attempting to see how long an oil would last between changes, testing might be useful, but, for me, there are so many variables I'd have to build in a sizeable margin of error anyway.

For example, I go 10k on full synthetic in my 4Runner, but if I'm towing or doing a lot of backcountry runs in summer, I'll go 5K.

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