Showerthought: I thought that 'diesel fuel additive' stuff was just snake oil for years.

Had a stubborn 6.7 Powerstroke with constant injector knock, and a guy at the parts counter in Boise swore by a specific cetane booster. I tried it for two tanks, and the knock smoothed right out. Anyone know if this works on older mechanical engines too, or is it just for the new computer-controlled stuff?

2 comments

2 Comments

vals382mo ago

Yeah, it's a good feeling when that old engine finally quiets down.

gavin_allen482mo ago

My buddy's old 7.3 IDI ran way quieter after he started using some additive in his fuel.