Oil Cap Off Engine Running

So you take the cap off.

Oil cap off engine running.

My car has 95000 miles. My car has an automatic transmission. Now let us know the possible damages of driving with oil cap off. You and your friends cars have a lot of life left in them most likely.

If your really concerned you can have a competent mechanic run a compression test. The danger is the dust that gets in. But you will get some condensation of oil on hot parts around it and a mess. It very much depends on the engine and where the oil cap is.

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. If you leave i. An engine oil cap keeps things safe and reduces the chances of loss.

Also depending on the specific cars there are other things to check e g. Contrary to some o. Those that do probably have a lot of blow by from bad rings. 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.