What Is 'blow By'

[Beer Baron]

how to tell normal blow by from excessive? simple. if your car keeps shooting out it's dipstick then you either have excessive blow by or your catch tank has been incorrectly plumbed resulting in your crankcase not being able to breath. like ERD said it can be hard for the average punter to tell what is normal and what is not just by looking under the oil filler cap of a running car. and likewise filling a catch tank can be due to excessive oil in the head getting flung out under cornering not due to combustion gasses leaking past the rings (blow by).

[GTRPowa]

how to tell normal blow by from excessive? simple. if your car keeps shooting out it's dipstick then you either have excessive blow by or your catch tank has been incorrectly plumbed resulting in your crankcase not being able to breath. like ERD said it can be hard for the average punter to tell what is normal and what is not just by looking under the oil filler cap of a running car. and likewise filling a catch tank can be due to excessive oil in the head getting flung out under cornering not due to combustion gasses leaking past the rings (blow by).

I agree with post, however if their dipstick is old and loose to start with... Not to mention everyone's opinion of 'old and loose' will be different. My dipstick came out when I bought the car, but it was old and loose. Replaced it with genuine replacement and haven't had that problem since.