Quote:
Originally Posted by PalmSpringsE534.6
Have you ever done a "hot" oil change and used 1/2 quart of ATF fluid, got it to temp...then drove 100 miles...and then did another change back to full 5w30 synth? Some folks swear it cleans the oil journals and gets any varnish out. I'm reticent but willing as long as I don't kill my X. LOL.
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I don't endorse this... buuuuut I do have some experience doing similar. Bought a poorly maintained e61 5'er last year in March with ~180,000 miles on it. Poor thing had sludge on everything, the valvetronics were hard to recognize in areas. After doing a bunch of catchup maintenance I wanted to clean the inside of the engine. So I filled it with the cheapest Oreilly 5w-40 (I think that was the weight) and 1 quart of ATF. I ran it in there for about 300 miles. Made a HUGE difference. Car now has 192,000 miles on it and is our current daily driver. Below is the before shot, unfortunately I don't have an after as I did this after a VCG and all related gaskets, plugs, coils, etc so I didn't take the VC off again for after pics. But I did stick a scope in there and look around. Much cleaner.
Again, disclaimer; I don't recommend it but it worked great in this one particular instance. As a part of the disclaimer, it does throw a "catalyst efficiency below threshold" code every so often. Comes and goes. Not sure it's related to cleaning all the gunk out or just a symptom of cats that have 190+ thousand miles on them.
