NOACK - Carbon Build up - A40?

[Jetronic]

Is it still the prevailing thought that intake carbon buildup comes a lot from NOACK properties of an oil?

About to get my intake valves walnut blasted on my Macan S (128k mi, V6 twin turbo), I mostly use M1 0w40 FS. Will probably just stick with that and 5k intervals (filter 10k). But I'm curious if there's a diff oil I should consider that's A40 or as good as A40 and has lower NOACK.

Noack on 1 hand, exhaust gas reversion on the other. I'm going with a no VII, ester containing oil in my DI engines anyway. 10W-30 to be precise. I could likely get away with a 20W-xx even in the coldest of winter, so 10W-30 allows the winter grade to slip and still be more than adequate.

 

[Jetronic]

I've never seen any actual data to support this relationship. Intake valve cleaning is simply a maintenance item on any DI engine no matter the oil, fuel, or whether you run a catch can or not.

I was thing to fit something like a pneumatic tool oiler in the pcv system, so an intake cleaner can be fogged regularly. Should be easy to fit just before the intake.

 

[facility1]

what do the spark plugs look like?,proper heat range being used?? maybe change fuel to a higher value,,, Pennzoil euro-5w-40