Oil gets passed through the pcv system from the engine back into the intake and the turbo is also oil lubricated as well as cooled via coolant so that probably explains some of the oil also. There is def oil that goes back into the intake...and it def causes intake valve carbon buildup. There are things you can do to slow it down a lot and combat it. Use really good synthetic oil and change often...don't do the 10k oil changes ford recommends (I don't recommend it anyways). Needs to be closer to the 5-7 range at the max imo. Get an engine oil that plays well with DI turbo engines. There are certain driving habits that can help too and an occ is another method to help some. How much has yet to be proven but if it helps any it's worth it for me. I've read that in high boost apps the modified pcv can raise pressure inside the crank case but you can opt for the can with the breather on it like I did from damand motorsports and I also have a cfm oil breather cap so I should not have any issues with too much pressure in the crankcase. I've sent my initial logs to Ryan at PD tuning waiting on my first revision for 93 then on to e30...I'm pumped because the car feels pretty good as is on a super concervative base tune with 93. Catch can will be installed this weekend.
Not gonna agree with you here and will say we should be careful in stating things as fact when you choose to gave an opinion that goes against the plenty of proof catch cans don't help with carbon buildup prevention, and many other owners and tuners will agree with me... Stock 16+ induction hose especially has more advanced oil separation and what gets through is the thin stuff that gets burned off, but I will say that whose who modify the 16+ intake with older evap hoses or adapters may get more oil into the intake too, but still, Stratified has a great article that explains how catch cans don't prevent carbon buildup
HERE, specifically note the technical reasons why [MENTION=8727]MagnetiseST[/MENTION] was on the right track when he mentions not the right vacuum, in the right place to really help when it specifically comes to carbon buildup... Now if you want to install them anyway to maybe keep some thin oil out of your IC and charge pipes, that might be effective. I just wanted to point out the actual technical reasons how catch cans don't help with carbon buildup, it's not like years ago when there wasn't 2 factory oil separators in play already, mechanics will also make up their minds years before the tech changes and too stubborn to revisit that opinion when the tech does change... I totally agree in using SN Plus rated full synthetic changed every 5-6k, driving it hard to burn off as much stuff possible with an e30 tune (alcohol vapors will help clean out PCV system) and always using Top Tier to keep injection tips and exhaust valves clean... Anyway, nothing personal, just trying to spread some knowledge when there is plenty of evidence to the contrary of what you claim as fact man... Also, WMI and Aux fuel is the only guaranteed way to prevent it and they have chemical services you can do into the intake system directly that can "help", especially if you stay on top of it when new and do the service as often as you can.
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