I have spent many an evening trawling through the VQ oil analysis thread on th my350z.com site by RESOLUTE. This led me to use Mobil 1 0W40 as my oil of choice (£19.99 +vat for 4l at Costco)
see link below if you are sad enough like me
http://my350z.com/forum/engine-and-driv ... -info.html
If you just want a quick summary of findings here is one quote from RESOLUTE/Will
Resolute
Registered User
Join Date: Apr 2003
Location: @7000 ft
Posts: 2,016
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Quote:
Originally Posted by Biochem7
can we use 0w-40 in the Z?
Absolutely. Check the Oil Analysis sticky right below this one. M1 0W-40 is one of the best performing oils so far in the VQ. In that same thread, there is a list of manufacturer specs for various oil's viscosities. M1 0W-40 is included, and from that you can see it is a thin 40 weight, or a really thick 30 weight depending on how you look at it. Either way, it is not so thick as to be overkill or have adverse affects for NA use if that's your concern. Besides being one of the few oils to meet Porsche's standards for the GT cars, it is also one of the few to meet GM 4718M certification- the unique spec created by General Motors for Corvette oil. It’s a high-temperature requirement that tolerates less oxidation (thickening) and volatility (boil-off) on a standard engine test called Sequence 111E according to engineer Bob Olree of GM Powertrain. It is voluntary for oil companies to let their oil be tested for approval, so there are other oils not certified that would probably qualify, but M1 0W-40 is one of the few that sought the certification and that alone is a good sign of the quality of this oil for NA use.
Will