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If you used the Eular service center by Globus, I wouldn't take their word for anything. When they replaced my turbo under warranty, they broke a clip and thought it'd be a good idea to zip tie the connector back on. Took them 6 months to order the right part (first 2 parts were wrong). They told me 5W-30 as well, but their lack or integrity, knowledge and professionalism when repairing my car makes me take anything they say as a joke. Plus I doubt the months and years that went into developing the b58 by very well educated engineers who recommend 0w-20 as the main oil to use isn't for nothing. I understand the arguement for the LL01 vs non certified oils, but different weights is another story. Yes, the manual says you can use 5w-30 depending on the operating environment (such as Canada, Northern Europe, Russia, etc), but here in Ktown where it gets to 15-20F I don't see why a thinner oil like 5w-30 would be necessary.
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