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Mixing different grades of motor oil 200 1991

posted by  doubleblue on  Thu Mar 3 06:38 CST 2005
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last visit: Fri Sep 26 11:19 CST 2008
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Hey everyone,

I'm a first-time poster but a long time reader. My family has owned one Volvo or another (all RWD) for many years and we do a lot of the routine maintenance ourselves so we're familiar with Volvo quirks and virtues. Currently we have a 1995 964 and a 1991 244.

My dad recently bought a case 20W-50 oil because he wrongly thinks that thicker is always better for our hot California weather. I'm gonna buy a case of 10W-30 oil, which I plan to either use straight or mix 50/50 with the heavier stuff. Both grades are Castrol GTX.

Would mixing the two grades yield a net viscosity rating of 15W-40, which is the heaviest recommended grade, or would it cause problems (sludge, leaking, etc.)?

Thanks.






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New Mixing different grades of motor oil [200][1991]
posted by  doubleblue  on Thu Mar 3 06:38 CST 2005 >


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