I just do an oil change for '94 LS400, it's recommending either 5W30 or 10W30. I use Peak Oil 10W30 I have FAR from PB few weeks ago, when I pour it into engine it looks very thin, as thin as M1 0W20 or PP 5W20. I wonder if Peak made mistake having 5W20 grade in 10W30 bottles.