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what oil to use in my 5.3 07 sierra DD ?

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Old 01-01-2014, 07:19 AM
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clean oil is the best oil
Old 01-01-2014, 07:24 AM
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Originally Posted by 96capricemgr
Look up CST@100C 30 weight is a RANGE and depending where in the RANGE an oil falls a 10w30 can be thinner than a 0w-30, not always, in CAN BE.

I went directly to M1s website and looked up the viscosities here.
http://www.mobiloil.com/USA-English/..._1_5W-30.aspx#
Look under technical details. CST at 100C of 11.0
Go here and look up product data sheet on the 10w-30.
http://www.mobiloil.com/USA-English/...1_10W-30.aspx#
there it is 10.1

The 0w-30 advanced fuel economy is 10.9
http://www.mobiloil.com/USA-English/..._1_0W-30.aspx#
The 5w-30 ESP has a viscosity of 12.1 which is just barely higher than the 10w-30 high mileage which is 12.0

Just so you get a better idea of the scale their 0w-40 has a CST@100 of 13.5 and the 5w-20 has a measurement of 8.9.

I gave you a few links here and rattled off more numbers pulled from the same website, it is up to the individual readers if you want to understand it or go on believing the myth that 10w-30 is thicker than 5w-30, it can be but as I have just detailed in M1's product lineup that is not the case.


If someone is a big M1 fan and thinks a slightly thicker oil might benefit their motor going from their standard 5w-30 to standard 10w-30 is the opposite but you could switch to the high mileage or ESP in 5w-30 would both be thicker.
Their density is almost identical and the real surprise is, the 10w30 density is "thicker" than the 5w30 and that's weird, if it's thicker in one test and thinner in another... but viscosity isn't just thickness, but stickiness or lack thereof... a measure of slipperiness and stickiness. Density is purely about thickness in the case of the mass of oils. Either way, I don't really see why 1 unit of measure matters more than the rest, even though you are directly pointing out what looks to me like operating temperature viscosity. That said, these are both 30 weight at that point, unless something is different in how they mix the 2. Of course, they offer an out on the bottom of the information, saying "Typical Properties are typical of those obtained with normal production tolerance and do not constitute a specification."
Old 01-01-2014, 07:41 AM
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So you want to dismiss operating temp because it doesn't agree with the popular misconception you want to push.
Old 01-01-2014, 12:49 PM
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YEP!

No, actually it simply doesn't matter. As I said, 1 of several and they claim it's not necessarily accurate, though it probably is. I just don't care and think you're trying for no apparent reason, to make this appear to be some significant deal when it just never will be. The stats are so close, the minor differences will positively never make a single bit of difference to any engine in the history of the world, or its future, as long as both oils are being recommended for and used in the same engines.
Old 01-01-2014, 02:34 PM
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I already said as long as you use something close to the factory recommendation it is all splitting hairs. You are the one who was suggesting 10w-30 over 5w-30 or someone concerned with burning oil but at the same time you are trying to backpedal and ignore the manufacturer spec for operating temp.

The data I posted is splitting hairs, but it DOES PROVE a 10w-30 can be thinner at operating temp than a 5w-30 and you just can't man up and admit you didn't understand things as well as you thought you did.



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