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Originally Posted by rob_liss_lms10
I used to use Penrite 10x40, started a slight leak,put in all the additives to stop it including Fuchs (engine honey?)stuff but the leak persisted. Recently I changed to Royal Purple 10x40. The leak has gone, I dont know if the oil had anything to do with that or the additives have finally done the trick. I change oil every 5000k. I also used to use K & N oil filters but have changed to Fram racing. The funny thing about Royal Purple is that the oil really is purple, quite freaky really. Haven't done a oil change yet so cant comment on what it is like after 5000k.
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I'd choose AMSOIL over Royal Purple. Or ELF Excellium. These meet the latest specs.