AQ290 DP Shifting to Neutral Problem
05-04-2026 | 09:32 AM
#32
Registered
Joined: Aug 2019
Posts: 1,237
Likes: 418
From: BC
75w90 vs 90w gear oil is very similar at operating temps.
It's the low water temp at startup and initial warm up where the 90w can be a problem.
At 60°f
75w90 150-200cSt
90w 400-600cSt
212°f both are in the 13.5-18.5 cSt area.
It's the low water temp at startup and initial warm up where the 90w can be a problem.
At 60°f
75w90 150-200cSt
90w 400-600cSt
212°f both are in the 13.5-18.5 cSt area.
Today | 07:37 AM
#33
Registered
Joined: Aug 2013
Posts: 169
Likes: 46
From: bellingham wa.
I don’t think it will hurt it to run either the GL4 or GL5 gear oils, Volvo has strange recommendations, in my old 280 drives I just ran non synthetic gear oil for years even though they list 30wt motor oil, I think the only thing is don’t run synthetic with the older 280 that have the brass clutch cones as it’s too slippery. The only real issue is the outrageous cost of the gl5 75/90 gear oils, I will soon have 3 drives to fill up at 35 bucks a litre.
