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PJS: re 'Better oils would be: Mobil 1, Fuchs/Silkolene, Amsoil, Liqui Moly, Redline, Motul, than the generally sufficient big brands (Castrol, Shell, etc)' what evidence is there that the first listed oil makers are 'better' than the last two? I also cannot see why severe service applies to all vehicles: again, is there evidence that accepted European extended OCI are harmful where correctly applied? Obviously there are certain patterns of use (short runs etc) where the oil should be changed early as the engine maker states this. Just wondering what info you may have.
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