Thread: diesel oil into petrol car?

Originally Posted by twitchy

YES THERE IS!!!!!!!!!! The high detergent levels in the diesel will peel so much crap out of a used engine it doen't do them any favours, the crap can block oil paths & filters & cause lots of dramas.
If it was a fresh engine there would be no worries with it.

how much sludge and carbon buildup is there going to be on a vehicle with 80,000km and regularly serviced ?
The detergent levels in diesel oil isn't that high, otherwise Japanese indirect injected diesels wouldn't have the problems they do with sludging. Talking to oil blenders, there is only so much 'room' inside an oil for additives, and the really good diesel oils are approx. 25% add pack, but this includes all the EP and anti-wear additives, as well as the detergent/dispersents, but the levels aren't that great that huge chunks of carbon are going to be ripped off oil galleries in an instant.

The worst that can happen is that with long term use the cat may be 'poisoned' by the metallic ash additives (phosphorous ?) used in diesel oils.