I worked on a lot of GM diesel trucks at my old job...specifically light duty (1/2 ton to 1-ton pickups) with the 6.2L or 6.5L turbo diesel V8s...the newer Isuzu "Duramax" engines are a nightmare but don't get me started on those.
There have been a couple trucks in for a fuel system drain/flush due to people putting gas in diesels....and no, the engines didn't rev uncontrollably.....and the bill wasn't $500 either because it only pays typically 2-3.5 hours labor to do that at $90/hr (Canadian) and there aren't any expensive parts involved. Maybe it would cost more in a diesel car like a VW or whatever, I don't know because I've never done them and I don't know what's involved.
We did have one, that the oil lines were leaking oil into the incoming intake air going through the turbo, causing it to rev to 7,000+rpm...take out the key and you're holding it in your hand...still does it and runs exclusively on its own oil. Another time, I saw a guy in a cube van with a 6.5L drive it in without the oil pan on it (and therefore no oil) because the steering was too hard to turn without it running. Those GM 6.5s are tough as hell and it's too bad they replaced them with the dumbax.
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