I use a water oil cooler on my car. Works really nice and dropped oil temp 50 degrees.
Plus the oil heats up faster.
Of course your cooling system has to be capable to handle the heat.
Pour point of -56 is impressive for sure but kinda meaningless.
Amsoil 15w40 DME has a pour point of -40. It's CCS at -20 is 4000
HPL has a pour point of -56 but a CCS of 4300 at -20.
So the amsoil flows better even though the pour point is higher.
The specs on Amsoil 5w30 look pretty stellar to me. Oxidation of 60= serious amount of esters.
This ain't no Walmart shelf special. 🧐
I really like their Signature Series 15w40 diesel oil with a HTHS of 4.5.
I think Amsoil makes a lot of good products.
I like their:
0w40 powersports
5w30 tractor hydraulic fluid
15w40 SS HDEO
Universal red grease
Diesel treatment
PI treatment.
Plus you support American workers.