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I currently have a built FA20 engine with a 10.0:1 ratio and run Mobil 1 Full Senthetic 5W-30. Personally, I think she runs pretty good but a little rough on the initial start since the oil is cold (in 40 degree weather). But once she's warmed up and running my oil pressure stays around 20-30 psi. I personally buy mobil 1 since the price is more affordable and is still a reputable oil.
So far no issues but I would like to try the Rotella T-6 at some point too.
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