Originally Posted by lawsy
Its called blow by, when fuel/air mixture is blown by the piston rings and it creates crank case gases, this is why cars have a crankcase breather it releases the pressure and recycles them to the intake.
This is why you should never let a performance car idle for long periods, it causes borewash.
If your breathers become blocked the gases cannot escape which then causes the oil to become contaminated, (it happens naturally anyway), but quicker on short journies as car is never up to full operating temp= full protection.
Engines in cars with short stop start journies will always have more wear than a car that does 100 miles on one go.
If you do 100 miles in one day, start your car then drive the 100 miles your car runs through the unprotected period 1 time
If you do 100 miles in one day, start your car, drive 2 miles stop for 30 minutes, drive another few miles, stop for 30 minutes, drive some more, stop for an hour, pick mrs up, have lunch, drop mrs off, drive another 5 miles, stop for fuel then coffee, start again then again then again. You travel through the unprotected stage many many times in the same 100 mile range.
So yes he is telling you the truth, but modern oils can cope with this.
Just change your oil every 6k.
All should be ok just get yourself a warranty
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