Quote:
Originally Posted by Pimpreza
Diesel is just a thin oil with detergents added, I'd probably use petrol in the box if I wanted to get rid of all traces of old oil if I was changing from/to something like Redline which doesn't mix well, just fill it up and lift off the ground and spin the box a few times to dilute what is in there but otherwise I wouldn't bother.
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Definitely don't start the engine with only petrol in the gearbox, you'll destroy the bearings in no time.
Even spinning a roller bearing with no oil in it by hand can damage it.