I have an F10 generation BMW M5 with a Turbo Valvetronic Direct Injection (TVDI) 4.4L V8, that has two variable geometry turbochargers running BMW's Valvetronic and Direct Injection. I just changed to Ravenol VST 5w-40 (LL-01) and was suggested to consider Red Line's Euro 5w-40 with LL-04 rating because of a slightly lower sulfated ash content. I want the 5w-40 viscosity for my Central Texas Summer heat where the Summer temps can reach over 100 Â°F for weeks at a time. With the Summer tires, if the temps get much below 40 Â°F, I'm not driving the car, so I think a 5w is where I want to be. I'm interested in others thoughts/comments. I love a good base stock and both Ravenol (PAO) and Red Line (ester) have excellent base stocks.