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I have been wondering, is there a big difference between normal synthetic and true synthetic? I only know that Mobile 1 0w40 and Castrol 0w30 are the true synthetic ones. Is this all for brands that make true synthetic? i want engine oil that has thick 40 weight rather than light 40 weight like...

I would like to get UOA done on my castrol engine oil and oil filter. Where do i need to send these?

Does anyone have UOA result for Greddy 5w40, and PP 5w40 for out VQ engine? I went to Greddy car show few month back and seemed like people like that Greddy oil. I've heard that Penzoil Platinum is not True Synthetic although many Z/G owners like this oil..Is it or is it not? One last question...