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Re: w30 vs w40 fair?
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Posted by cheaptech [Email] (more from cheaptech) on Thu, 10 Aug 2017 10:38:08 Share Post by Email
In Reply to: w30 vs w40 fair?, Norm9-5, Thu, 10 Aug 2017 04:46:52
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the trend from many manufactures is to spec out lower viscosity oils in the interest of better fuel economy - but on a turbo or a gdi engine I think that may not be the best.
I think on my 1986 9000T I would run 20w-50 in the summer months. That engine was like new when the car was totaled with 230k miles - it used hardly any oil and compression was high and even in all cylinders. Not so with the 2004 9-5 as it will burn a quart or so between changes.

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