20-grade oil does not "protect" anything. It may allow certain ancillary components to work, but it is only because they were purposely designed (and restricted) to work with that grade of oil. There is no inherent advantage to the thinner oils whatsoever except increased fuel economy.
Another 0w16 Post, but....
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What exactly does this mean.
If the gf6a service spec is on both the 0w16 and 0w20 bottles, what doesn't the 20 do?
Hey you're back.
It means that the MOFT is what protects and prevents metal-to-metal contact. Thinner viscosity grades are closer and closer to allowing that to happen. You're almost on the edge with the HTHS of a 20-grade. Therefore it provides little protection.
First line of wear mitigation is viscosity (oil film thickness, MOFT).
Second line of wear mitigation is anti-friction/anti-wear additives (film strength).
This Machine Lubrication article explains it well.
www.machinerylubrication.com
Second line of wear mitigation is anti-friction/anti-wear additives (film strength).
This Machine Lubrication article explains it well.
The Importance of Lubricant Film Strength
Discover why film strength is one of the most critical lubricant properties for protecting a machine’s internal components.
www.machinerylubrication.com
Ok, but I was comparing the w16 to the w20, not say 20 to 30 or 40. If the 16 is what the OEM calls for then what is the 20 not doing? Certainly they too know HTHS and MOFT, right?
Don't allow facts to get in the ways of opinions and feelings by the armchair chemical engineers on this forum.
20s too can do more. The link from monday had more than just the HTHSV of SAE 0W-4 in it, another link for you might be to the Castrol ... A 0W-20, if still considered to be especially interesting over there (some threads in the making in Russia...) https://www.bobistheoilguy.com/foru...ive-saves-2-on-gas.221157/page-2#post-5474646
Ok, so the 16 and 20 are by all accounts on the edge of being par, and the OEM's are ok with this.The 20 is not giving them as many CAFE credits as the 16.
So CAFE aside, the 20 is still a more viscous oil at temp, yes?
Back? I have been on BITOG since it 1st went online. I do not have the need to come here that often.
More viscous than what? The 16 grade? Yes. It’s a 20-grade.
So then what is the 20 not doing that the 16 was doing?
Not giving the same MOFT as a 30-grade.
Or 40-grade too, yes?
The 16 does MOFT of the 30?
I regret, and apologize for facilitating the continuation of this thread.
WE also know the power of a false statement-
quote- Therefore it provides little protection.
Then my 2018 Silverado (5.3) running 0/20W pulling my 5,000 pound travel trailer should have blown up by now............it has 27,000 miles on it-waiting for disaster......
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