Question about synthetic motor oil in my 6.0L
#16
Also from Tx. My 5W-40 synthetic (have used both Valvoline Premium Blue Extreme and Shaeffer 9000) performs just fine in the heat. Oil analysis data shows that it is fine. All oils will shear in our 6.0L engines - some more than others ..... but it is not a function of being synthetic 5W40 or not. As 69cj stated, the 5W40 performs as well as the 15W40 at the high temperatures. That is defined by its "40" rating. The wider range is achieved with superior base stocks as compared to conventional oil.
As I posted earlier - Ford is selling a 5W40 oil now and recommends it for ambient temperatures over 100 degrees. They also have kept the same recommended oil change interval - 7500 miles normal (or 6 months) and 5000 severe service (or 200 engine hours).
Also fyi - it is the fuel that lubricates and cushions the injectors. The oil is a hydraulic fluid
As I posted earlier - Ford is selling a 5W40 oil now and recommends it for ambient temperatures over 100 degrees. They also have kept the same recommended oil change interval - 7500 miles normal (or 6 months) and 5000 severe service (or 200 engine hours).
Also fyi - it is the fuel that lubricates and cushions the injectors. The oil is a hydraulic fluid
#17
I'm from TX an ran the Rotella Syn. 5w-40 for 3 oil changes (15k miles) and each and every time when I would reach ~4k miles the injectors would get real loud at idle. When I would drain this oil it would drain out like water and the oil felt like it was a very low viscosity.
I went back to running Delvac 15w-40 with 2 quarts Mobil TDT 5w-40 and no more loud injectors. I got 102k miles on this truck and decided this will be the oil I'll run from here on.
I went back to running Delvac 15w-40 with 2 quarts Mobil TDT 5w-40 and no more loud injectors. I got 102k miles on this truck and decided this will be the oil I'll run from here on.
Too each his own and whatever your truck seems to prefer. Based on the threads here and on other sites you are in the minority. But do what is best for you. No debate here.
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