the problem with newer diesels without piston squitters(cool oil on down stroke).They use diesel to give a rinse,so it goes out of exhaust stroke and keeps the catalytic material red hot. You can find hard ware to over write second pluse of fuel.Bio on hot cylinder walls create a hard grease,alot of engines damaged with only 10,000 miles.

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1999 w140, quit voting to old, and to old to fight, a god damned veteran, deutschland deutschland uber alles uber alles in der welt