Synthetic Gear Oil in 6MT

[Turkeypen]

Determined that I need @ 9 quarts of synthetic 75-90 to do front and rear diffs and transfer case on 6MT. Priced Mobil 1 75-90 at @ $11 per quart at Advance Auto. Napa had Valvoline at about the same price. Could not find gallons. What gives?

The NAPA dealer suggested I consider WYNN'S, which he sells to auto dealers in bulk. Never heard of it.

Any suggestions on WYNN'S or possible sources for 75-90 synthetic in gallon containers?

After reading their website, I may be willing to be th Guinea Pig on this one if no one has used it

Picture added because posts without pics really blow . . . .

 

[knoll0351]

Don't have any answers for your question but liked the pix added

 

[shfd739]

When I did mine I used Amsoil in Qt containers. Even with shipping it wasnt too bad price wise. I had also paid for the one year club thing so I got better pricing. I bought a bunch of stuff that year so I saved money.

Drained then put new in with a parts store bought suction gun. FWIW all driveline fluids in my FJC were swapped to Amsoil at the 3k miles mark (man. trans, axles and transfer case).

 

[Cruiserdrew]

The most important place for the synthetic is the transfer case. Don't really know FJCs but I'm guessing 2 quarts or there abouts. That is generally the hardest working 2 quarts of gear oil in the whole truck, and thus a good place to use synthetics.

Then just use conventional gear oil in the differentials. If you get in water at all, you'll want to change it anyway and it hurts to throw out $40 in gear oil to change out a diff.

I can recommend from long term use the Coastal gear oil sold by AutoZone. It's just conventional GL-5 gear lube but if you buy it in the 5 gallon pails it works out to $2 per quart or so. Then you can afford to change out the gear oil anytime you think you might need to.

 

[ken_79-fj40]

The most important place for the synthetic is the transfer case. Don't really know FJCs but I'm guessing 2 quarts or there abouts. That is generally the hardest working 2 quarts of gear oil in the whole truck, and thus a good place to use synthetics.

Then just use conventional gear oil in the differentials. If you get in water at all, you'll want to change it anyway and it hurts to throw out $40 in gear oil to change out a diff.

I can recommend from long term use the Coastal gear oil sold by AutoZone. It's just conventional GL-5 gear lube but if you buy it in the 5 gallon pails it works out to $2 per quart or so. Then you can afford to change out the gear oil anytime you think you might need to.

I have used this same gear oil in everything I have besides the automatic transmission in the 4 runner and the T5 in my mustang for years. Never had a problem with it. The transmission in my 05 tacoma (very similar to FJC) seems to really want synthetic though. It doesn't like to shift into second when it's cold at all for a few miles. I'm actually thinking of using GL4 Redline MTL in the trans.

 

[Turkeypen]

Over on the Blue Forum, the FJC guys are all about synthetic gear oil due to: (1) issues with the rear diff and (2) gas mileage. While I still run Dino in my '82 40, I am all about running synthetic in my FJC. I just have trouble pulling the trigger at $11 a quart for Mobil 1 or taking a chance on Winn's.

FYI, Mr. Toyoda has apparently switched to full synthetic for gear oil on FJCs from 2008 forward.

So, this is a shout out for any input on Wynn's gear oil as I am getting ready to buy some in bulk . . .


Cruiserdrew, thanks for helping out with the rear cross member for Jay's 40! I am his assistant on that project and it was really a godsend.

 

[Cruiserdrew]

Cruiserdrew, thanks for helping out with the rear cross member for Jay's 40! I am his assistant on that project and it was really a godsend.

Glad it arrived OK. The UPS gal was like WTF??? Cracked me up. Post up a pic or two when you have it welded in. Glad it could find new life.

Back to syn oils in the diff. For sure they are better, and for you average never think about it user, probably give better service life. But for a wheeler, with frequent submersion, I'd use something cheaper that could be changed without regret.