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This has been posted already but I'll use this opportunity to sound 1/4 smart.
Factory fill in Corvette engine,and I believe Land Rover,Mercedes Benz,and Jaguar are all synthetic.
If the manual calls for a 5-30 stick with that unless it is very cold.Use of a 40 weight will probably cause no real harm but the thicker oil will result in a minimal reduction of efficiency(probably not noticable but it will be there)
I can think of nothing negative to say about a "0" wieght oil.
In heavy duty tractors like Kenworth's an Peterbilt's if you want extended warranty on your Eaton transmissions and differentials you have to use Eaton approved synthetic gear oils.
Hope this is helpful (and I hope I was right about that 1/4 smart bit)
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