I've used sea foam on every car I've owned, including my diesel (it is diesel safe). It basically does the same thing...cleans everything like crazy and spits it out the exhaust...I've had very good results, much smoother running than prior to treatment. Make sure you're in a very open space, it can make a lot of smoke on gas engines.

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TC
Current stable:
- 2004 Mazda RALLYWANKEL
- 2007 Saturn sky redline
- 2004 Explorer...under surgery.

Past: 135i, GTI, 300E, 300SD, 300SD, Stealth