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Frosty:

According to nissan... the viscosity at 7.5W will be the best, but that's not available in the market... therefore, the best alternative will be 10w range.

I read on the hypertech magazine on the 350z.... it says that we shall avoid using 0w range product as it is not good for the VTC that we are running... I am not too sure why exactly it isn't good though... but they do recommand 5w and 10w range...

That's also why I swapped out my 0w-40 straight away after reading that... but with turbo cars, I think 0w-40 is the best option though...

cheers,

richie
 

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Richie I thought a 10W-50 or 10W-60 would be better suited to the higher temps of a turboed car which has oil running through the turbo's,
I'm trying the 5W-60 Penrite Syn5 oil at the moment.

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Just wanted to chime in that the oils with wide viscosity range have a lot of additives to do so. One of the side effects will be that the oil will degrade a lot faster and it'll not be as stable.

Myself I just got Mobil 1 10w-30 and I'm going to mix it with my left over Motul 300V 5w-30. I've been very unhappy with Mobil 1 5w-50, the car ran like crap. Noisy, terrible cold starts etc.

There's a lot more to oils then the viscosity numbers. The best place to get more information about oils is http://www.bobistheoilguy.com, there's more to oils then marketing and there are numbers behind it. There's a very informative forum on that website. Here's an introduction which explains that there's more then just viscosity. http://www.bobistheoilguy.com/basic_lubrication_design.htm
 
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