11-16-2017, 10:18 AM | #15 | |
corner barstool sitter
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Just because more than one weight of oil is Dexos1 Gen2 certified doesn't necessarily mean you get to pick which of those weights to use.
From a recent repair industry newsletter. No mention of 'weights' is made for the GM Dexos spec like there is for a number of other mfr oil specs in that same article. The implication is that for normal use you'd use what's in the vehicle's own basic documentation (which would include the oil fill cap). Quote:
Norm
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11-16-2017, 10:29 AM | #16 |
Hot Dog
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I'm not sure who you're telling this to. Tell it to the factory. Tell it to the owners manual. Tell it to the performance supplement. All three vary.
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11-16-2017, 11:02 AM | #17 |
I used to be Dragoneye...
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So I reached out to one of the engineers at the Tonawanda Plant I have a very good relationship with.
The LT1 is factory-filled with 5W-30, currently. There was a brief period where they used something else more than two years ago (didn't say what)...but your car should have been filled with 5W-30. Don't know how to explain the oil analysis...though, it at least explains my confusion. I remember being told that less than a year ago. |
11-16-2017, 01:43 PM | #18 | |
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Quote:
If there's any difference between the OM recommends/requires and what the factory filled it with (and the OM is correct), that doesn't obligate the car owner to continue making the same mistake. If the OM is in fact wrong, the problem is probably higher up in the food chain. Norm
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11-16-2017, 01:58 PM | #19 | |
Hot Dog
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Quote:
So what do you trust? A potential typo, a logistics confusion, or 3rd party data?
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11-16-2017, 03:56 PM | #20 |
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11-16-2017, 04:39 PM | #21 | |
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Quote:
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11-16-2017, 04:42 PM | #22 | |
corner barstool sitter
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Quote:
3rd party data is obviously at the mercy of logistics. As far as logistics errors are concerned . . . the car in my sig was delivered with cambers nearly a quarter degree outside the factory range - almost a full degree more negative than factory preferred (no, I didn't have it corrected). And another car I ordered came with the wrong instrument cluster. Errors on the production line happen. Norm
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11-17-2017, 08:09 PM | #23 |
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It could be that the factory filled it with the wrong fluid.
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11-18-2017, 09:38 AM | #24 |
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I wonder what the Gen V's are filled with in other GM vehicles?
Anybody else want to play "whatabout", or is there any other data out there?
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11-18-2017, 07:16 PM | #25 | |
I used to be Dragoneye...
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Quote:
Mine is now resting snugly in the garage for the winter. |
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11-19-2017, 04:00 PM | #26 |
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Well, my 2015 5.3 silverado calls for 0w20. Where are our 6.2's made? I've heard they were made in Canada, but my window sticker says made in the U.S. So which is it?
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11-20-2017, 09:34 AM | #27 | |
Hot Dog
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Quote:
So coming back to what Norm is asserting, that we can't just pick our viscosity: how come GM can?
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11-20-2017, 10:06 AM | #28 |
I used to be Dragoneye...
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Because they're the ones who engineered the vehicle...
We can, of course, do whatever we want. But to discount their expertise and recommendations isn't the wisest thing I've ever heard of. |
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