I'm scheduled for my 7500 service and would like to start using a synthetic oil. My service department offers Castrol Syntec as their synthetic option. I asked this board about that brand and the majority of responses were negative. The service department will use any oil that I supply them with. So, what is the best synthetic to use? I've seen a few posts praising Amsoil as the best. Any opinions on this brand? Be specific in recommendations as I've found that there are different grades of many of the synthetics, ie. 0W-30w, 5w-50w, etc. I've got 2 weeks before the service appointment which is plenty of time to find what I eventually select and have it delivered if mail order is used.
Thanks all.
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