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Is 20w50 Castrol GTX the same as Mobil1 10w30 syn? (archive)
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Posted by Brett A. on April 15, 2001 at 15:28:27:

I planned to add Castrol GTX 20w50 but at the same time I am curious about Mobil 1. So which type of Mobil 1 weight would be good to use in the summer?
Thanks Brett A.
86 535i 212k

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