Amsoil 5w30 SS - 5,800 mi - 22 Colorado 3.6L

[buster]

I sent this sample off last Monday and just got the results today.

Sample 1 - Mobil 1 EP 5w30 Triple Action
Sample 2 - Amsoil SS 5w30

I put 4k of the 5,800 miles on within a week driving out to South Dakota. Rest is probably 50/50 city/hwy. I'm happy with these results.

I requested TAN. Not sure why they didn't include it. Probably why they said to contact them. Oxidation is perfect so I ignore that.

 

[DirectRejection]

Would have been lower oxidation with HPL.

 

[drtyler]

Looks good. What went back in?

 

[buster]

Would have been lower oxidation with HPL.

Baseline for HPL is around 23 for PCMO. Baseline for SS is 48-50.

 

[buster]

Looks good. What went back in?

Amsoil 5w30 SS.

May run HPL 5w30 No VII after that.

The engine only had 15k miles on it with the Mobil 1 and was in service during a different time of year, under much different conditions. That should be taken into consideration.

 

[Slick3914]

With those results I’m not sure there’s incremental benefit over using Mobil 1, but that’s what we do here, LOL

The late model GM 3.6 engines don’t get the respect they are due. Very good power and great fuel mileage.

 

[buster]

It would be interesting to see how Mobil 1 would have done under same conditions/same mileage. The Amsoil did very well though.

 

[fantastic]

Appears to be "broken in" & wear metals have come down quite a bit from the previous sample. Silicon is showing very low on both which is excellent results. Fuel not out of touch & viscosity seems to be just fine at that level. If fuel stays reasonable like this result that makes a 7.5-10k mile ODI easy. This SS is long drain oil as you well know.

 

[buster]

I'm actually surprised fuel dilution was 1.9% considering all the highway miles I put on.

 

[buster]

Here is a VOA of this oil from same lab.

 

[fantastic]

Here is a VOA of this oil from same lab.

View attachment 242139

Then their tin flag is moot on your UOA. Viscosity well in grade still. I think 7500 miles could be the sweet spot for that oil without going too far with it (room to spare). How are you liking the Colorado? I know you trade up but still plan on keeping it for a bit longer?

 

[buster]

Then their tin flag is moot on your UOA. Viscosity well in grade still. I think 7500 miles could be the sweet spot for that oil without going too far with it (room to spare). How are you liking the Colorado? I know you trade up but still plan on keeping it for a bit longer?

Good point. I'll be curious how it does over winter and how it holds up to more short trip/cold weather. Should be interesting to compare.

I enjoy the truck a lot. Not too big or small. V6 is nice and transmission is smooth. There are some minor issues I've had - paint chipping on driver's side door handle, key will get stuck in ignition now and then. Other than that it's been solid. I think GM did a great job with the new one. I plan on keeping it at least another year, maybe longer. I'm going to play it by ear at this point.

 

[RDY4WAR]

The virgin KV100 of the M1 EP/TA 5W-30 is 10.45 cSt. Factoring out the 1.7% fuel dilution, the KV100 of the oil alone is 9.89 cSt meaning the M1 EP/TA 5W-30 sheared -0.56 cSt. (-5.36%) That's actually decent for an API oil with a 35 SSI OCP.

The Amsoil SS 5W-30 has a virgin KV100 of 10.3 cSt. Factoring out the 1.9% fuel dilution, you get 10.28 cSt meaning that oil didn't shear at all.

Neither oils were run long enough to see any substantial increases in viscosity from oxidative thickening, soot loading, etc... thus, I'm not factoring that in. This also assumes the KV100 is exactly 9.400, 9.700, etc... which it likely isn't.

I see no reason you couldn't go 10k miles on the SS 5W-30.

 

[Triple_Se7en]

Amsoil S.S. over Mobil-1 EP T/A by my Overwhelming Decision. This is the 3rd UOA I've seen that convinces me I made a mistake getting the Euro over the S.S.

 

[buster]

From the Acadia forum - GM 3.6L and Amsoil SS 5w30. Just used in a very different way (not my report). 10 mile round trips and some highway. Fuel dilution in GDI engines for ya.

At 4.6% fuel dilution, the viscosity became 8.8 cSt.

 

[ltslimjim]

From the Acadia forum - GM 3.6L and Amsoil SS 5w30. Just used in a very different way (not my report). 10 mile round trips and some highway. Fuel dilution in GDI engines for ya.

At 4.6% fuel dilution, the viscosity became 8.8 cSt.


View attachment 242254

Held up very well, given relatively short trips and less opportunity to burn off excess fuel.