My vehicle-a 2005 Ford Ranger with open differentials- calls for 80W-90 gear lube.
I'd like to use synthetic but the only 80W-90 synthetic I've found has friction modifiers already mixed in.
Will using lube with friction modifiers in my plain diffs hurt 'em?
Also, a synthetic 75W-90 is available without FMs. Can I use that or are differentials that sensitive to weight?
I need to know as the sales are going on now.
I'd like to use synthetic but the only 80W-90 synthetic I've found has friction modifiers already mixed in.
Will using lube with friction modifiers in my plain diffs hurt 'em?
Also, a synthetic 75W-90 is available without FMs. Can I use that or are differentials that sensitive to weight?
I need to know as the sales are going on now.