I agree with that. Some blends have only about 25% or even less synthetic oils. However, for those oil seals requiring "petroleum" to stay swelled, synthetic blends have an advantage.
And some hotter running engines use only true synthetics (Group IV or V synthetics, not the Group III faking as "fully synthetic"). You'll find them as European formulas on the market. Primarily Mobil-1 0W-40, and less common is Castrol European Formula 0W-30.
Hey, maybe that's why most US synthetics won't cause leaks, because they're not truly synthetics like those European oils.
Quote:
Originally Posted by fenixus
i'm not convinced synthetic blends are any good though hehe ... i always like to go with the weakest link in chain and since they have both dino and synthetic in it, so I would have strong doubts about it, just my personal non-mechanical opinion (you can ignore it hehe). price sounds good though! 
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