I have an '09 Jeep Liberty with 50k on the odo. It calls for 75w140 in the 8.25 rear differential. Is this actually needed? It seems like over kill on a smaller vehicle that does not see any extreme use or towing. I was wondering if dropping to a 75w90 would be a better option and possibly be more efficient?
Is 75w140 actually needed? Chrysler 8.25
- Thread starter Johnny248
- Start date
You would be fine to run 75-90 but I wouldn't expect it to save you any gas mileage.
That differential does not care. Mine made it to 215000 on 80w90, 85w140. When I pulled it apart to regear it, I couldn't tell if it had 21,500 miles or 215,000 miles on it. And it's lived a hard life.
How often do you change the fluid that a few extra bucks for the thicker fluid is going to be a hardship? In a day when manufacturers are specing thinner and thinner oils, I'd think people here would jump at the opportunity to use a thicker one when it's even approved by the manufacturer.
Especially the fact they're using more oils on the thin side of the grade. My Dana 80 spec'd 90 too but I replaced it with 75-140 at 80k miles. It had a good chunk of metal on the magnet.
There's also 75W-110 now, the 140W recommendation is likely from before 75W-110 existed, and 75W-90 could be either thin or thick
IIRC, and this was borrowed from the allpar forum, the choice to use a 140 weight was a cautious move implemented when they had axle shaft alignment problems in a small number of units. The problem was small and infrequent enough that Chrysler spec’d the 140 weight as a preventative measure.
if you have one that’s made it this far without issue, it’s probably proven itself to be a good one, and you can run what you want. If you want to split the difference, amsoil has a 110 weight.
if you have one that’s made it this far without issue, it’s probably proven itself to be a good one, and you can run what you want. If you want to split the difference, amsoil has a 110 weight.
Agreed doesn’t matter
