^That is a completely true statement. BUT.....some oils are ranked differently than others. Example: Mobil 1 super 5000 is a ISLAC GF-4 oil and the Mobil 1 regular synthetic is a ISLAC GF-5. I wouln't say that 0-40 is a "true synthetic" in comparison to a 5-30 because all you are measuring against is the weight of the oil
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