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Do a search under maintenance for viscosity...Lots of info there (especially from oilman). Of hand, non-modded gt-r to lighly modded gt-r, 10w40 is fine.....Just make sure you use synthetic....
 

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State of tune and use are the determining factors.

We recommend fully synthetics for higher levels of protection and viscosity should be determined by the following in broad terms:

Stock road car 5w-40

Tuned/track car 10w-50 / 15w-50

If you would like specific advice for your car then just contact me via my website at Opie Oils

Cheers
Simon
 
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