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Oil Cap Suction

 
Old 12-29-2018, 11:50 AM
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Default Oil Cap Suction

I'd like to see how many people have significant suction through their oil fill cap. My local Audi shop seemed baffled by the fact that I had such a large amount of suction in the system. Reason being is, if there is suction in the crank case it will be pulling on any seals in the block, potentially causing leaks or catastrophic failure down the line (their words, not mine).
They had a 2017 RS7 with 8k miles on it in the shop, and it required a similar amount of effort to pull the oil cap off.

If anyone has definitive info as to whether this is normal or not, please comment. Otherwise, please post your vehicle details, whether or not you've replaced the PCV valve, and if you have suction through the oil cap. Shouldn't take but 15 seconds to pop the hood and try and remove the oil cap with the engine running =).

I'll start with mine:
2013 A8L 4.0T
PCV replaced
Suction through oil cap

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Old 05-21-2019, 01:15 PM
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Originally Posted by sushistrip View Post
I'd like to see how many people have significant suction through their oil fill cap. My local Audi shop seemed baffled by the fact that I had such a large amount of suction in the system. Reason being is, if there is suction in the crank case it will be pulling on any seals in the block, potentially causing leaks or catastrophic failure down the line (their words, not mine).
They had a 2017 RS7 with 8k miles on it in the shop, and it required a similar amount of effort to pull the oil cap off.

If anyone has definitive info as to whether this is normal or not, please comment. Otherwise, please post your vehicle details, whether or not you've replaced the PCV valve, and if you have suction through the oil cap. Shouldn't take but 15 seconds to pop the hood and try and remove the oil cap with the engine running =).

I'll start with mine:
2013 A8L 4.0T
PCV replaced
Suction through oil cap
Hi Folks,

Resurrecting this thread as I have a similar question so if anyone can reply on if their oil filler cap is very difficult to remove due to high engine vacuum at idle - this would be greatly appreciated
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Old 05-25-2019, 10:07 AM
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Completely normal. High engine vacuum is very common on modern engines. It helps the low friction rings seal better.
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