I use mono grade 30. Not because some guy on TF says so but because my owners manual that was generated w the input of engineers says so. Also I firmly belive there is no need for milti-vis oils. Unless one leaves an engine for years there's plenty of oil film left on engine parts for startups. If it was not so millons of cars would be falling appart. I've read several times that higher viscosity and engine life/wear are directly related. It would seem the highest viscosity oil that can be used w easy startups is the best oil. The very slight increase in friction will cause an quially small increase in fuel consumption. No doubt but I think it's basically fly stuff.
If we needed to start our engines in cold temps or run our engines whereass oil temps get really hot multi-vis oils aren't needed and the extra additives are not helping w lubrication.
I use Chevron Delo 30w.
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Eric
North Western Washington State USA
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