Quote:
Originally Posted by Scrappydoo
So wouldn't the conclusion be that 5w/30 is best?
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Not necessarily, it only continued the trend shown in the first two, there wasn't a dramatic increase in improvement to my eyes and I do a lot more cold driving than hot and as a commute car I'll take the fuel savings too. I'll do a uoa of the 0w-20 when it runs through probably this winter and update. If the particulates jump up I'll agree with you that the engine is in steady state wear and the 0w-20 wears faster than the 5w-30, but right now I'm inclined to believe I've caught the end of the engine settling in for the long haul.
It also had slightly less track abuse than the two 0w-20 samples as my co driver was a novice (double duty that day, car ran like a champ except for the coilpacks)
I think one of the conclusions of this data (among many others posted before me) is that the 7,500 mile interval is fine, even with some hard running, all this b.s. about changing oil every track day or 3k miles or the 0w-20 is too thin is just throwing money out the window. Sure there are special circumstances, but as pointed out by Stang above me an even longer interval can be performed with confidence.