Mobil 1 EP 0w-20: 9,816 OCI: '07 Accord

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Here is a direct comparison between Mobil 1 EP 0w-20 and Amsoil Signature Series 0w-20 oil. Both in use for 1 year, 70% Hwy, 30% city.
Both had 1/2 quart makeup oil added over the interval. Both very good oils with similar TBN retention. The only difference to notice is the small increase in iron for the M1 sample as compared to Amsoil.
Code:


miles on oil 9,816 9,538 7,780 5,842 6,358 Universal

miles on unit 101,611 91,795 82,257 74,477 68,635 Averages

sample date 9/16/2016 08/30/2015 08/26/14 10/26/13 03/10/13

make up oil added 1/2 1/2 1/3 0 0

OIL Type M1EP 0w-20 ASM 0w-20 ASM 0w-20 MC 5w-20 HG 5w-20



Aluminum 3 3 3 2 2 3

chromium 1 0 0 0 0 0

iron 9 6 6 4 5 9

copper 1 1 1 2 2 2

lead 0 0 0 1 0 1

tin 0 0 0 0 0 1

molybdenum 82 135 116 23 43 73

nickel 0 0 0 0 0 0

manganese 1 1 1 1 0 1

silver 0 0 0 0 0 0

titanium 0 0 0 0 0 1

potassium 0 1 8 0 4 2

boron 34 64 74 49 3 46

silicon 20 18 19 15 9 12

sodium 14 15 8 0 3 48

calcium 1447 3387 3434 2283 2192 2026

magnesium 592 11 16 12 14 213

phosphorus 557 592 676 760 688 684

zinc 695 729 770 794 799 806

barium 0 0 0 0 0 0





SUS viscosity @210F 52.0 54.8 53.9 48.2 49.5

cSt viscosity @100C 7.88 8.70 8.45 6.72 7.12

Flashpoint 375 350 430 380 375

Fuel %
Antifreeze % 0.0 0.0 0.0 0.0 0.0

Water % 0.0 0.0 0.0 0.0 0.0

Insolubles % 0.3 0.2 0.2 0.3 0.3

TBN 3.2 3.3 4.2

TAN
 
More fuel dilution in the Amsoil sample as well. The significance is probably negligible.

 
Wow! 50% more Iron, but wear numbers still look great. Now the big question is... Is it worth the price difference for the Amsoil?

I wonder how Mobil1 0w-20 AFE would do?
 
Perfect example of why it makes no sense to use Amsoil. Stick with M1.
 
Amsoil SS 0W20 has strong KV@100*C retention , but M1 EP 0W20 (and all other brands) shearsss..
 
Originally Posted By: zeng
Amsoil SS 0W20 has strong KV@100*C retention , but M1 EP 0W20 (and all other brands) shearsss..


The SS 0w-20 has the following virgin specs:

Visc @ 100C: 8.7cSt
Flashpoint: 228C (442F)

We look at his two SS reports and we see:
#1
Visc @ 100C: 8.45cSt
Flashpoint: 221C (430F)
7,780 miles

#2
Visc @ 100C: 8.70cSt
Flashpoint: 177C (350F)
9,538 miles

The first sample shows a small degree of viscosity loss based on the presence of a small amount of fuel in the oil, indicated by the drop in flash point. However, the 2nd sample, with obviously higher fuel, has higher viscosity. This is not viscosity retention, the oil is diluted with fuel and the viscosity has risen to the point of virgin. This would be oxidation.

Comparatively, if we look at the Mobil product:

Virgin:
Visc @ 100C: 8.60cSt
Flashpoint: 235C (455F)

#1
Visc @ 100C: 7.88cSt
Flashpoint: 191C (375F)
9,816 miles

Which shows some predictable viscosity loss based on the fuel dilution reflected in the drop in flash point.

Given that M1 EP 0w-20 is 60-70% PAO and has a relatively low VI of 173 and a high flash point, one can reasonably conclude that it would have very little in the way of VII to shear in the first place. This is also the case for the SS 0w-20, which looks quite similar on paper, though we are not privy to information that would tell us as to the amount of PAO in it.

I would be more curious about the oxidative thickening of the SS than the viscosity loss due to fuel dilution of the Mobil product in this case. I don't believe there are any grounds to assume shear is a culprit in this sample. The 5w-20's lost far more viscosity than this 0w-20 did, despite having a much narrower visc range.
 
If that one sample of MC means Motorcraft 5W20 that looks like the best bang for the buck compared to Amsoil( which Amsoil was used, XL, Signature etc0 and Mobil 1. Of course the sample was almost half the miles as well.
 
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