Transmission fluid

[gene knight]

Need info about changing out fluid in a 4 speed bolted to back of L16, idk if I use 80w gear oil, I was told to use a SAL brand.

[datzenmike]

80w90 GL-4 (NOT GL-5) is fine for most Nissan standard transmissions. If synthetic be sure it is 'copper' or 'yellow metal safe' to protect the brass sychro rings. The drain bung usually has a magnet to collect any ferrous metal filings. A black paste is normal, just clean it off so you know what has collected at the next change. In about 30K miles.

[gene knight]

Thanks for the info

[KELMO]

I use the NAPA Brand  "Sta-Lube" 85w90 part #SL24239  API/GL4.

[G-Duax]

I use the NAPA Brand  "Sta-Lube" 85w90 part #SL24239  API/GL4.

 

I tried several synthetics, but up with Sta-Lube before it shifted the way I thought it should.

Even synthetics saying that they were GL4.

 

Oh, and it (Sta-Lube) is made by CRC, but NAPA is one of the few places to find it.

Many Toyota people are finding this stuff really works also.

[datzenmike]

Running GM Delco (synthetic)  Syncromesh Transmission fluid (friction modified) in my five speed for about 2 years. It's a first year zx so a mid ratio similar to the early 280z, 810 and 620 5 speeds. I found it in a wrecking yard, the car so destroyed I thought it a mid '70s car and the valve cover was an L20B. Replaced my 620 5 speed with it and ran it for 10 years and retired it only to put it in my 710 about 5 years ago. Mileage unknown.

 

 

Shifts are much much faster with reduced effort. Not saying I 'pound the gears' but it just is easier to shift.

 

Shifts are easier when the transmission is cold in the morning. With the 80w90 the first few miles you have to push or pull the shifter firmly into gear and often into second, you can feel the gears mesh. Not quite a grind.

 

Downshifting!!! What a pleasure to downshift free of slight grinding before the corner in town that half way through at the slowest speed. 

 

Like all synthetics it can easily pass old seals and my rear one is damp even though new when the 5 speed was installed. Last spring I checked before Canby and oil still dripped out the fill hole when the bung was removed.

[scooter]

Im also running gm synchromesh with good results.

It also works great in old chevy 4 speeds.

[gene knight]

Kelmo: I went to Napa and the 85w90 GL-4 is expensive $35/gallon? Wth?

[datzenmike]

Most Nissans need about 2 liters so $9  each. 

[G-Duax]

Kelmo: I went to Napa and the 85w90 GL-4 is expensive $35/gallon? Wth?

 

$26 on-line with free shipping here:

https://www.amazon.com/Sta-Lube-SL24239-GL-4-Multi-Purpose-Hypoid/dp/B000M8RYMC

[MantisX620]

Im using Redline MT-90 in mine. Doing well so far!

[KELMO]

Oh yeah, forgot to mention that it was about as high as giraffe snatch.

[datzenmike]

Im using Redline MT-90 in mine. Doing well so far!

 

I expect it's the same thing as Delco, Royal Purple and other such. The same manufactures makes the base synthetic stock and just adds colorant to it. 

[Stoffregen Motorsports]

Im using Redline MT-90 in mine. Doing well so far!

I love the MT-90 and use it in all the Japanese manual transmissions that come through my shop.

[datzenmike]

Hadn't planned to DD my 710 this winter. But it has dipped to -5C.... whatever that is. Well below freezing and the shift quality is unchanged. Heavy frost and there's snow right now frozen on the roadsides.