Australian Car Repair Issues? Ask an Auto Mechanic for Answers ASAP
sound like the engine started making more breather gas or using a bit of oil and a previous owner has bypassed the regular feed back to the intake
now in theory this is fine but you will get a lot of fumes coming out of the neck of that bottle and the gases can often be explosive so I'd say its worth trying to put it back to normal to see how bad it is like this
if it starts running badly then I'd consider doing a compression test next to confirm that all the cylinders are within 10-15 psi of each other
this sounds like the engine may be breathing quite heavily so the blow-by gas is pushing out past the pistons you will get a small amount of oil carried over in the gas
this is normal - but if its excessive hen it can give running issues
do you still need help?
Bear in mind that the site takes a deposit from you at the beginning and this is held by the site until you rate my answer at which point the cash is split between the site and the expert. I am only paid for my work on this question if you rate my answer, using the star system at the top of the screen. Please do not forget! Thank you