OK... so explain to me how a 75 winter rating versus a 80 winter rating is really going to make a big difference at cold temps and how a 140 rating hot with a 75 is much different than the 80w 140. I've got time.
Mopar 75w-140
- Thread starter ensoniqman
- Start date
Here is something on 75 W vs 80 W for a 90 grade gear oil at 40 below. Just for entertainment value.
Yes, 75w90 can be a whole lot more robust than people think… there are some semi haulers owned by a VERY well-known NASCAR team that is using @High Performance Lubricants 75w90 as they trek around the country…
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Deleted member 89374
Most trucks use 75W-90 in their drive axles. I got my dad to use 80W-140, but his truck is old, and though he had the diffs rebuilt, it's better to be safe than sorry. But 75W-90 will help with the MPG, for sure.
Right. I’m not suggesting anyone who has an axle that calls for a 75w140 use a 75w90, just pointing out that if the axle calls for 75w90 there’s not necessarily anything to “gain” by stepping up in viscosity here, when many 75w90s are up to the task.
a 75-90 real synthetic i quite stout + there midgrades as well as 75-110 options either bought or blended by you!!! dumped my factory nissan semi syn 75-140 in favor or redlines real 75-90 syn years ago + never looked back + do light coal hauling without issue!! changed ALL other drivetrain lubes to Redline + got 3 MPG's average increase
