06 Dodge
Senior Member
- Joined
- Jan 4, 2022
- Posts
- 1,917
- Reaction score
- 1,811
- Location
- Forest Grove, Oregon
- Ram Year
- 2022
- Engine
- 6.7L CTD
The oil change indicator/computer has no way of knowing what motor oil you have in the crankcase. All it does is measure miles and idle time. For all Chrysler vehicles we had in the past or currently own, it's been 1% / 100 miles. For example, at 1000 miles on new oil, the OLM was at 90%. If idle time was higher, it might have been at 89%~88% at the same mileage. It didn't matter if the engine was running on Castrol EDGE EP 5W-20, Mobil 1 EP 5W-20 / FS 0W-40, PUP 5W-20, or Red Line 5W-30.
PUP uses 100% GTL for base oil, and PP uses a mix of GTL and Group III. Group III base oils have the best additive response out of all base oils, when compared to PAO, ANs, and even POE. Esters can and are used with Group III base oils. However, Shell does not use Esters in PUP or PP products.
Shell has improved their GTL manufacturing process a lot, to the point where 0W-20 and 5W-20 use very little to no VII, neither do they need a lot of PPDs to meet their winter rating. For an API licensed oil, it's decent, just about as good as everything else that's competing against. Comparing PUP with Mobil 1 or Castrol is pointless. They will all perform the same, within the margin of error. Amusingly enough, even AMSOIL Signature Series performs similarly to the upper-tier API licensed oils like PUP. That's because AMSOIL designed it that way. The only "premium" thing about AMSOIL Signature Series motor oil is that it might last a bit longer in service. However, the TBN numbers that I've seen in UOAs at 10K, 15K miles for AMSOIL SS didn't look any better or worse than Mobil 1 or PUP. Conclusively it's a motor oil like any other. Suppose you want something that performs better than these oils as far as high-temperature protection and drain interval length is concerned. In that case, you have to move away from API licensed oils and look the boutique and racing/industrial lube manufacturers.
As to PUP 0W-40: this is an oil that covers a long viscosity stretch. Shell is stubborn about keeping this one all GTL, and the result is something that shears easily, has a high NOACK value, and doesn't flow very well at below zero temperatures. They might have improved GTL, but it's still not good enough to use only by itself in an oil such as this. When it comes to off-the-shelf 0W-40 lubes, nothing beats Mobil 1 FS 0W-40. Performance and value for money are amazing for this one. To get to such a performance level, Mobil 1 uses PAO, GTL, POE, and an esterized additive package. Then again, they came out with it in 1994, and had plenty of time since then to refine it, to the point where it's become inexpensive for them to blend.
My username history is publically visible. I thought this one was funnier, I liked it better. Since I no longer own a HEMI, it wouldn't be right to keep using the "Hemi" name in my username:
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If M1 is so good then why did we get better mpg when using PUP 0w20 compared to Mobil 1 or Mobile 1 0w20 advanced fuel economy oil?