Thread: GM warranty cover synthetic oil? Factory fill LS3
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Old 09-09-2013, 11:45 AM   #33
Scott@Bjorn3D


 
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Quote:
Originally Posted by markgws6 View Post
Do you have any proof that the Pennzoil synthetic will not cause the same damage at 90K?
No proof of that, but the testing from Blackstone Labs and others show it to be much better than Mobil 1.
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