2004 GMC Sierra 6.0 18k engine 2083mi M1 5w30

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2,493
Location
MSP 'burbs, MN
Quote:
Sure I'm going to get flamed again for the short run time of the oil..oh well.
LOL, no kidding. Why bother running Mobil 1 for 2,000 mile OCI's? Any quality conventional oil can EASILY perform just as well over such a short interval. Anyway ... as Blackstone mentioned, the viscosity seems a bit high for M1 5W-30. Heck, 70.0 SUS @ 210 is the viscosity of a 40-weight oil. Did any of your previous UOA's show viscosity increases like this?
 
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5,785
Location
Dixie
This is the Mobil 1, 5w-40, ie Delvac 1 and not their 5w-30. You can tell by the absence of MoDTC and the presence of approx 400 ppm of magnesium. Since you live in Florida, the regular M1/10w-30 will probably work best. I see no advantage in going with the 5w-40, based on this data set. TS
 

Mighty HD

Thread starter
Messages
176
Location
Florida
That's right, I did have 5w-40 T&SUV in it. I forgot to change the paperwork before sent it in. I put in M1 5w30. Jeez I must have been out of it.
 
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