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Message: [QUOTE="jd f350, post: 634169, member: 1920"] Valvoline Premium Blue Extreme 5W-405 The Blue Extreme oil’s cSt viscosity level (12.17) fell within Blackstone’s acceptable range but was still below the 12.49 of a 40 weight oil. The real downfall was the rapidity within which the viscosity level fell. The oil change interval was only 3700 miles. This indicates that the Blue Extreme oil is on par with the Rotella T6; however, there is only one UOA worth of data as compared with the two or three UOAs for the other oils discussed Interesting... I have used Valvoline extreme 5w 40 synthetic for the past 90K. I send my samples in to Blackstone at 7500 and they always extend me 2k. I've been running 10K oil changes for about 4 years now. [/QUOTE]

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