Originally Posted By: Jeffs2006EvoIX
Just would like the forums view on this quote from Penzoil in regards to intake valve deposits and oil and what not.
Oil volatility is not a significant factor for inlet valve deposits in a direct injection gasoline engine. The significant factor is viscosity modifier type and concentration, so using fully synthetic narrow span viscosity grades such as 5W-20 is beneficial. In North America, there is no specification calling for NOACK of less than 10%. The most important thing for DI engines is engine design, to better prevent deposits on ITV’s (In Take Valves), since there is no fuel wash as in PFI (Port Fuel Injection) engines. "
So if this is the case would an oil like Redline 5w30 be of benefit?
Jeff
I can only comment on my personal experience which is documented extensively here in these forums...
My previous car was an 2008 Audi A6 3.2 and the valves would gunk up to the extreme every 1,000 miles (yes, every 1,000 miles) that the only recourse I had was having the dealership on a brand new car pulling the headers off and manually scrap the values as best they could then using crushed walnuts to spot clean the rest. By 10,000 miles on a brand new car the dealership, Audi USA, and my patience ran out. No I was not lucky enough to get a new engine, because we found a winning combination that mitigated the problem and kept the car running well enough that I eventually put 100,000 miles on it.
Fuel: Exxon/Mobil or Shell 93 octane
Fuel Additive: Chevron Tektron in every other tank fill.
Oil: Mobil 1 ESP 5w-30 (imported from Germany)
BG Valve cleaning system every 10,000 - 15,000 miles.