Originally Posted by TuRbO-CaB-LaD
it may be the dumbest thing u eva heard mr safe chav but it stopped mine from rattlin/knockin wen driven hard as soon as i changed it, so if it wasnt the oil cap that was causin it, wat eva it was that was causin it must of fixed itself at the same time as i changed the cap ayyyyyyy
Duno mate
Ring a tuner and tell them what you told me.........if they dont laugh i will be well and truely amazed because there is no logical explanation for that.
As i said above, you cap shouldnt even blow off in the first place, so you have pressure build up on your crank case (which is bad), probably blow by from worn rings and bores!