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Discussion Starter #1
What happens when you take the oil filler cap off when the engine is running at idle? (DETT engine).
 

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Not much, some steam is coming up and it idles not so smoothly. But when you drive without the cap it´s getting messy under the hood and you run short of oil...not good
 

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Maybe a few oil splashes, maybe nothing.
Depends a bit on if your engine 'breathes' much.
 

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Discussion Starter #8
I found that my engine drops in revs, no oil splutter or anything. Is this a sign that the engine is in good condition?
 

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when the engine is running, if air comes out of the oil filler cap then I think this suggest ring/piston/bore wear problems. A good gtr should not "breath heavily" from the oil filler.
 
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