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? asked in Cars & TransportationMaintenance & Repairs · 9 years ago

Air coming from oil cap, good or bad?

I went to look at a car to purchase today. 2000 VW GTI 1.8T 5 speed.

I pulled off the oil filler cap to check for smoke. I heard that smoke or "blowby" coming from the cap is bad. The car was still cold when i did this. No smoke came out but a ton of air was.

Should i be worried if it's just air with no smoke?

Does it matter that the car wasn't warm yet?

2 Answers

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  • Lab
    Lv 7
    9 years ago
    Favorite Answer

    Yes it matters that it wasn't`t warmed up. By the way, the`air`was blow-by and all engines do this to some extent.

  • Art
    Lv 4
    9 years ago

    It's a normal condition. The crankcase pressure is released through the pcv valve when you take the oil cap off it vents through the oil cap because it's a bigger opening.

    Source(s): Red Seal
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