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I know the OEM drip tank had a vent but most aftermarket applications I have seen do not. If the vent is too low, it may be below the oil level in the engine case at times. I have run my turbo oil drain direct to sump, electric scavenge to chain box, and now cam driven mechanical scavenge pump to breather cover all without venting and so far no issues.
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Steve
Sapere aude
1983 3.4L 911SC turbo. Sold
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