amsoil 20/50 14.00 qt in 1999 the court ruled that an oil that performed like a synthetic could be labeled as a synthetic even if it was not made from group 4 base stocks. so now it's almost impossible to know if an oil is truly synthetic. oil sold in europe as synthetic are the true synthetics they must be made from group 4 base stocks. synthetic brand oils in europe are a different formulation than the same brand sold in the u.s. the labels would would appear to be the same but the europe label would have a different product code number.
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