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If you did happen to have too much Diesel in the Petrol BP, then you might notice a little blue smoke in the exhaust from the Car.
You can also get away with a little Petrol int he Diesel also, with no adverse affects on the Diesel Engine. In the really cold climates, they add 10% of Petrol to Diesel to allow easier starting. I don't recommend that for here though. If there is too much petrol, it will cause Pingking or more accurately, Detonation. A sound like someone inside the engine with a hammer smacking the metal. If the engine does that, then it is not good to run the engine for too long as damage can be done. If it does it during acceleration only, then just put the throttle down a little more slowly and get more diesel into the tank as soon as you can. You don't need to drain the tank unless you have filled a 1/3rd to 1/2 empty (or should that be 1/2 full) all the way up with Petrol.

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after switching from many years with diesel vans

 

to a petrol car

 

once made the error of putting $10-5 ltr of diesel into the near empty 60 ltr tank of the car

 

the attendant suggested waiting 2 hours and paying $120? to a guy who would pump it out

 

but decided that a petrol/diesel mix of 90/10 was unlikely to cause any problems so filled the car with petrol drove off without any noticeable difference

 

petrol / diesel at 50 / 50 however starts to give horrible running and lots of white smoke, but still provides low power (as found out when almost running out of fuel taking a small tanked ducati deep into remote mountains) 

 

the bigger danger is the other way round when anything above a 50 / 50 mix in a DIESEL engine is almost certainly going to blow out the head gasket when high octane petrol starts getting hammered by the 20:1 compression of  diesel engine.......... but again if you don't rev the hell out of it you may just get away with it

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