My first post, so hi everyone
I've got an old 1991 FG 4x4 Mitsubishi Canter truck. 3.3l diesel, formerly non-turbo, but now Turbo
. 4.5t truck so even turbo it's still a bit slow with an old 3.3l 4cyl soot chucker. It would be lucky to have 110-120hp
While trying to chase a drivetrain whine on recommendation I changed the Transfer and Diff's to Dino 85-140w (previously Dino 80w90)
However I'm now certain it has lost power, in such a vehicle this is most noticed on hills. Ie the ability hold speed or how much speed one looses.
Am I going crazy or it possible the drag of such thicker lube could be noticeable?
The rear diff is LSD front is opened (and not engaged on sealed roads, so out of the picture).
Normal region SAE 80 Warm region: SAE 90 (I'm inAustralia so it certainly can get warm)
Normal region SAE 80 Warm region: SAE 90
SAE 90 LS
Below 40DegC(104f): SAE 90 Above 40degC(104f); SAE:140
I've isolated the diff (driveshafts out, centre handbrake to load gearbox/transfer) and it's not causing the whine. I've also pulled the inspection cover off the transfer and it looks really good inside with no play anywhere so it's likely from the gear box.
It'd like to know fluids should I change to ensuring good protection but also minimising drivetrain loss?
I'm thinking splurging and going full-synth.
Given the above specs I'm guessing a 75w85 or 75w90 full synth LS should cover all components OK and reduce drag losses?
Do Synthetics help with gear whine also, or best to try an additive for that?
Brand availability will vary here as we have a number of local producers that make good products (Penrite, Nulon, Gulf Western etc) though stuff like Castrol is still available.
Here the truck/camper