Oil Cap Off Engine Running

If you leave i.

Oil cap off engine running.

My car has 95000 miles. Looking to buy a used car i was told that if air is blowing out of the oil fill cap when open while the engine is running it s a bad sign but i m wondering if this could be just how this model works. If your really concerned you can have a competent mechanic run a compression test. It very much depends on the engine and where the oil cap is.

Also depending on the specific cars there are other things to check e g. You and your friends cars have a lot of life left in them most likely. The car might go some miles without any problem but the damages might cost you to fortune later. Those that do probably have a lot of blow by from bad rings.

Contrary to some o. But you will get some condensation of oil on hot parts around it and a mess. Very few cars if any will throw oil out that tube. Placing your hand over the oil fill cap is not a great way to measure blow by and determine an engine s condition.

If you have a regular car with the oil cap on top of the valve cover and you open it at idle all that happens is you get to watch the cam or rockers activate the valves. An engine oil cap keeps things safe and reduces the chances of loss. So you take the cap off. The danger is the dust that gets in.