the bottom line is any oil of the correct spec from any big name is going to be fine just remember depending how fussy you are that not all full syns are actually that at all, many such as halfords are actually dino based oil and not a true synthetic, a legal loophole allows them to describe it as synthetic ( in fact mobil have been fighting this one in the courts for a while now as there mobil 1 is one of the few along with shell helix which is a true synthetic) i use valvoline synpower which is a great oil but again strictly speaking not a true synthetic, however i think the differences bewtween the pure syns and the others is very small, both perform way above most cars needs
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