Quote:
Originally Posted by Dephective
Oil smelling like fuel is due to fuel blow by from the direct injection system. High cylinder pressures combined with the direct injection fuel PSI = fuel getting past the rings. Happens on virtually ALL direct injection cars. Audi FSI, Mazda's MZR 2.3, etc. Perfectly normal. Only thing is I recommend oil changes a little sooner. I know that Toyota says you can go like 10k miles, but fuel dilution changes the lubricity a bit and I don't feel comfortable knowing it's in there. That's just a personal preference. I'm coming from a Mazdaspeed 6, and every oil change you get a little buzz from the 93 oct. :P
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it doesnt only happen on direct injection or fuel injection nor a carberated motor, it happens on all motors no matter if the cr is 7.5:1 or if its 12:1 its gonna happen on all motors. if there wasn't a lil bit of blow by in every motor you wouldn't have the proper vacuum you need an would most likely have a vacuum lock, do to no circulating air/vacuum with in the block of the motor. blow by is a must have on a motor but too much of course is a bad thing, too much meens you have bad piston rings and at that point you start burning oil and you will notice a dramatic drop in performance. i mainly work on v8s chevy or ford even a fresh built motor has blow by