I just ordered a case of the stuff, as two cans never seem to be enough. I like to run four to six cans and go on a little drive. Under load I think it cleans much better. Works fairly well in my experience, but it is a bit costly at around $10 per can.

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'02 BMW 325i
'85 300D 450k
'93 190E 2.6 170k(killed by tree)
'08 Ducati Hypermotard 1100S 6k
'06 Ducati S2R800 14k(sold)