The best thing to do here is get a certified mechanic to look at it because ur mate may say he knows his stuff but really his clueless. And just tell ur gfs parents honestly.
And as for your previous comment u sounded like a troll
I have personally seen an instance where diesel fuel was inadvertantly put into a petrol motor (4 cyl. engine). It started to smoke profusely, then stalled. The diesel fuel was drained from the tank, petrol put in, and after cranking engine for about 1 1/2 minutes, it started and ran fine. Diesel fuel will not ruin your engine. It will foul the plugs, and may cause trouble with modern fuel injection systems, requireing flushing, and purging of the system, but that's about it.
Diesel into a Yaris
in Yaris / Echo Club
Posted
I have personally seen an instance where diesel fuel was inadvertantly put into a petrol motor (4 cyl. engine). It started to smoke profusely, then stalled. The diesel fuel was drained from the tank, petrol put in, and after cranking engine for about 1 1/2 minutes, it started and ran fine. Diesel fuel will not ruin your engine. It will foul the plugs, and may cause trouble with modern fuel injection systems, requireing flushing, and purging of the system, but that's about it.