Let's say you're using M1 0w-30 in a non-turbo, with severe driving conditions. How fast can it thin out and need to be changed? If it was mixed 3-1 with M1 0w-40, would the change interval be extended?
How fast can Mobil1 0w-30 thin out?
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M1 0w-30 seems to be very shear stable if you look at the UOA reports on it. In fact, according to an SAE paper published by Mobil, it may be their most shear-stable 30-weight. I think the oil's weakness is volatility not shear stability.
So, it's more volatile, then does that means it actually thickens?
Tai,
More volatility in this case means it will burn off more easily, needing to be topped off more frequently.
More volatility in this case means it will burn off more easily, needing to be topped off more frequently.
But in Texas why even worry about it?? Just look at the posts in the UOA for the 10W-30. Really no need to fool around with anything else (IMHO)
Is there a spec that corresponds to shear stability?
HTHS is one spec. In the SAE paper, 981444, Mobil has a lineup of several oils. I'm reading from a shear stability chart where they are using test method CEC-L-36-A-90 to evaluate the oils:
I got great gas mileage with the 0w-30--noticably better than M1 5w-30, but my Acura RSX burned twice as much of it. Go ahead and try M1 0w-30. Your car may not burn it at all. Not all cars do.
The first 4 oils are PAO/ESTER synthetics, presumably Mobil 1.
I got great gas mileage with the 0w-30--noticably better than M1 5w-30, but my Acura RSX burned twice as much of it. Go ahead and try M1 0w-30. Your car may not burn it at all. Not all cars do.
Actually, I've been using it. Got 12 quarts of Mobil 1 TS 0w-30 a while back for real cheap. Then I started worrying that it'll shear down quickly in my Miata, with the way I drive.
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