Quote Originally Posted by solidate View Post
Has anyone that has a new Accord Euro tried opening the oil filler cap while the engine is running and warm ? My car was bought brand new 3 months ago and so far has done 5000k's. When my car is running and warm and I open the engine oil filler cap it has a lot of blow by. It has air pulsating out of the hole quite a lot, with fine splashes of oil spitting out of the hole. I heard this should not be happening in new engines. As it is a sign of air leaking out of the pistons during combustion meaning the piston seals are not tight and i'm not getting 100% combustion.
You are NOT supposed to open the oil filler cap while the engine is running. Doing so will result in oil splashing and hot air rushing out. That is not how you measure if you are getting proper sealing. If you want to measure it, you do a compression test.