Valvoline High Performance Gear oil

[buck91]

Going to be changing the front dif gear oil in my F150 (spec is 80w90, I will be using a 75w90 for improved cold weather viscosity since its almost only used in winter). Was initially going to use valvoline SynPower for a good priceerformance ratio but I saw Valvoline "high performance" 75w90 on the shelf next to it for a little more than half the price. Looking at the spec sheets I'm not sure what to make of it; The HP is MAGRINALLY thinner than the SP at 40 and 100C and shows a notably higher VI. Pour Point is notably lower on the SP but no brookfield -40C is listed... Not saying that the truck would realistically see the difference but isn't a higher VI generally an indicator of better base oils or does it just indicate the use of more VII?

High Performance: https://sharena21.springcm.com/Public/Do...12-ac162d889bd1
SynPower: https://sharena21.springcm.com/Public/Do...12-ac162d889bd1

 

[xtell]

buck91

I while back, I posted the same question you are posting. Seeing as how your vehicle states 80w-90 diff oil, you will be a head of the game with either the conventional or synthetic 75w-90 Valvoline gear oils. The comparison of the specifications for both oils does make them look similar, even though Valvoline likes to use different specifications for different gear oil weights.

 

[zeng]

Personally I wouldn't downgrade from a recommended KV40C 150 cSt 80W90 to any KV40C 100 cSt 75W90.
Having said that,in your context I would prefer SynPower FS 75W90 to 'High performance' 75W90 for its relative shear-stability.

 

[69Torino]

I would just pony up for the Synthetic (Synpower). I have it in two cars, my Marauder and my all wheel drive Hyundai Santa Fe. It’s been absolutely perfect in all weather.