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is this the catch can that adds vacuum to the egr line or is it just inline with egr tube going to the intake?
I'd be less worried about how much oil it's catching and just grade performance of the catch can on how much oil residue is coating the throttle body and upper intake area that you can easily reach and check.
No oil/gunk == good. The catch can is either working or doesn't have anything to catch in the first place.
Some oil gunk but lots in the catch can .... This is a red flag, you shouldn't be sucking oil into the egr to a significant degree and this is where additional vacuum could be hurting you more than any hypothetical help it is providing. If no vacuum, then other mechanical issues could be at fault.
some oil gunk but not much in the catch can ... catch can is not performing it's job.
Lots of oil and gunk ....problem. Hope you didn't do anything to get the dealer to try and void your warranty.
Obviously if you otherwise properly maintain the car and proactiively clean the intake area ...the catch can is overkill. Though, everyone on this forum has some aspect of the car they go overboard on ...keeping things clean is at least an area where overkill's only downside is a lighter wallet.
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