Motylgear is a GL-4+ (GL-4/5 compatible), which is fine to use in either; nothing wrong with that. I’d probably stick to the tried and true GL-5 for the differentials and hypoid gear applications. GL-4 and lower is more for manual transmissions/gearboxes, which need a yellow metal safe oil.
Does the manual specify whether the 75w-85 is a GL-5 gear oil or not? I would assume so, but I’m also not sure, as I’ve had plenty of different transfer cases that I’ve worked on. A lot took different kinds of recommended ATF, while some were spec’d GL-5 gear oil.
Since you’re using Amsoil...
I’m planning on leaving my next transmission fluid change, with Redline D4 ATF, in my Tremec TR-6060 (6MT) on my 2010 Chevy Camaro SS coupe. I’ve been changing it like every 4-6k miles or so, just because of how problematic my clutch cylinders were being. It would snick and feel like grinding...
Do you happen to have any links and/or resources on this? I swear I also did run friction modified Synchromesh from AC Delco for a while in a bunch of Honda’s and Acura’s, but I personally didn’t feel it was any better compared to a regular, generic conventional Synchromesh formula. That, and...
Seeing as how folks somehow get away with not changing manual transmission fluid for anywhere from 75-90k+ miles, I wouldn’t be surprised if you went 30-40k solid miles on that trans fluid, before maybe even considering changing it.
Is that Motorcraft MTF synthetic at all? Also, Pennzoil...
I’ve kinda been wanting to experiment with the two different Triax GL-4 75w-80 MTF’s/gear oils. They have a Synergy Gear ‘MT’, which is what you’d expect for a typical manual gearbox calling for a GL-4 MTF; and then they also have Synergy Gear ‘SF’, which appears to be some other form of gear...
I also forgot to add. The OEM Motorcraft (Ford) DCTF that is ran in the Getrag MT-82 manual trans, which comes on all 2011+ Ford Mustang GT’s, seemed to do pretty good in my Tremec TR-6060 on my 2010 Chevrolet Camaro SS manual trans/gearbox. I continued experimenting with other DCTF brands and...
So, I tried experimenting a couple of different OEM brand MTF’s/GL-4 gear oil, on a variety of different manual transmission-equipped cars. I think certain ones from Nissan and BMW, were fully synthetic by default, and also didn’t smell “funky”, so I assumed they were just fine to run. A bit...