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    2013 Yukon 150K 5.3L 10K OCI Mobile 1 5W-30

    How do. This is the first analysis. The viscosity came up as 7.8 based the the cSt 100C test. The 10K OCI has a fair number of idling hours. More than would be normal. Since I'd like to stay with the 10k OCI, I should go to a heavier weight oil. Would 10W-40 be sufficient? Also, what is an...
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