This Was Unexpected

[OldCowboy]

I plugged some Mobil 1 viscosity data into the Widman calculator. Specifically, for the 0W30 AFE, 5W30, and 10W30 oils. This was the resulting graph:

I expected the oils to rank 0W<5W<10W across the entire temperature range. In reality, the oils ranked 5W<0W<10W for all temps between -30*C (-22*F) and 60*C (140*F). I'm wondering if Mobil isn't marketing the 5W30 as such so as not to create confusion with the 0W30 AFE. I.e, they are both 0W30 oils.

 

[bepperb]

The big difference between the 5-30 and 0-30 is the HTHS spec. The 5-30 has been thicker than the 10-30 for at least 5 years. Really, the M1 10-30 (and probably any 10-30) has been obsolete for years.

 

[OldCowboy]

Originally Posted By: bepperb
The big difference between the 5-30 and 0-30 is the HTHS spec. The 5-30 has been thicker than the 10-30 for at least 5 years. Really, the M1 10-30 (and probably any 10-30) has been obsolete for years.


Not sure where you get this. The HTHS value for the 0W and 10W is 3.0 and the 5W is 3.1. I don't think a 0.1 difference is meaningful.

 

[friendly_jacek]

so, basically, you are saying that Mobil 1 5w30 and 0w30 is almost the same thing.
I'm not surprised.
If Mobil labeled that 0W30 many years ago, no one would buy it. Only recently 0WX oils are in vogue in USA.

 

[Oldwolf]

I'm not going to buy the 0W30 anymore and just go with the cheaper 5w30.