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Originally Posted by DRW1000
Back to diesel fuel...............You say you know from experience that this works? Interesting.I have heard this but I was always doubtful. Do you have any fear of ruining the cats or o2 sensors?
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If you go to the parts store and buy a product called "motor flush" in a silver cylindrical can, its basically diesel fuel with some of the volatility removed so it can be shelved.
I've done the diesel flush and it works pretty well. The transmission fluid is somewhat of a misconceived (but somewhat effective) method. It started way back with someone realizing that trannys were always spotlessly clean when they were torn apart. They assumed that the tranny fluid did some cleaning while in there and put it in their engine to flush it. The reason trannys are so clean is because they don't have blowby, carbon, and moisture build up like an engine. They have clutch friction material which gets filtered out, but its a sealed system in which no combustion takes place. There is nothing to make a tranny dirty in the first place, so people assumed that the fluid scrubbed it clean.
Transmission fluid does tend to flush out an engine, but I think its mostly because its the equivalent of 20wt. It flows in the nooks and crannys easier.
Diesel works pretty well, but like everyone else said, DON'T rev, drive, or even touch the throttle while its in there, and after the flush I would suggest driving very gently on the new oil until the volatiles have evaporated out. I might also suggest another oil change very shortly since there will be remnants of the diesel in there that don't evaporate.