Quote:
Originally Posted by FRS Dad
Okay, I did some research on this. Apparently ATF is thinner than motor oil, and it is a common practice on higher mileage engines to run a mixture of ATF and oil for a short period to clean sludge out of the engine, then do a couple of regular oil changes to flush any remaining ATF out: This was posted in response to a guy who had accidentally used ATF instead of motor coil.
"Actually, people used to put 'some' transmission fluid in the engine oil right before an oil change because trans fluid helps clean the gunk out.
I wouldn't keep it in there but I wouldn't have any problem with driving it for a couple days then getting an oil change."
Source:
ASE Master Tech for 22 years.
So it doesn't seem like the two fluids are totally incompatible. If they mix together readily then they can be flushed out together as well.
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"Some" ATF in an engine is not the same as "all ATF". Notice how everyone who does that uses the ATF as an oil solvent? I'd rather have oily gunk in my engine than a solvent. Ever seen a modern engine that has used a modern engine oil with "gunk" in it?
Whatever. 20 bucks just waiting.
ETA: There is (or was) an self-described ASE master tech posting on this very site I would not let put air in my tires.