Im using Motocraft Synthetic Blend, So I will have to check more into that.For oil you want something AN plus and with Dexos Gen2 spec. Penzzoil Ultra Plat meets it and is a good oil. Ultra platinum does not meet that spec.
I ran one step colder and didn't really notice a difference. Are you seeing the knock with light throttle or are you getting on it?
I noticed my truck, like you stated earlier, does not like it when I baby it and I see a lot of positive knock and that lowers my OAR.
What gas station do you use?
Its only when I baby it. Cruise set, knock goes postive, and OAR goes up. If i lean on the motor, and give it some postive boost, not even WOT, just light boost, the knock goes negitive and lowers the OAR. I have tried Shell and another 93 locally, not sure the brand, both are doing the same thing.
WOT knock and OAR is great. Motor runs great with no knock even when OAR is very low.