The FSM for 1989 states that the R150F manual tranny can use a 75w90 or 80w90 GL4 OR GL5 gear oil.

I have been hunting for cheap GL4 gear oil for my upcoming tranny oil change and popped open my FSM to see this. GL5 can be had for $5 a quart.

Is this no GL5 stuff hype? Can someone chime in who runs GL5 in the R150F?

I was told by a tranny shop that the GL4 craze is bull˟˟˟˟, and that ten years ago we were all fine running GL5 in our GL4 and 5 trannies, but now a few GL4 oils returned to the market and corrosion talk came about. Guy said in thirty years he has never seen this happen with GL5.

 

Lottsa people run GL5 in Toyota trannies with no problems.

I don't, I use GL-4, but I can source GL-4 oil for less than $60 for a 5 gallon pail.

Some older trannies shift a little better using GL-4 because it is less slick than GL-5 and worn syncros can use the help

I think that the corrosion issues that GL-5 once had have been resolved, but I can't document it.

I do know that more than 30 years ago VW cautioned against the use of GL-5 in their trannies.

 

If lots of people run GL5, that is all I need to hear. Between that and the factory service manual saying it is recommended, I cannot see why I would not use GL5 at $4.70 a quart over some specially oil companies GL4. I even think $10 a quart of Dino GL4 is too much. It is gear oil. GL5 it is. I will report results. I am going to use the cheapest stuff I can find, which is "TRAVELLER" brand 80w90.

 

I finished my drain and fill. I actually did everything (rear diff, front diff, transfer case and manual transmission) all with TRAVELLER 80w90 @ $4.70 cents a quart. It is GL5 MT1, so it should be yellow metal safe, as the MT1 rating has buffered sulfur. This stuff can be had at Tractor Supply Company. I am hard pressed to find gear oil any cheaper anywhere. It is manufactured by Warren (but labeled TRAVELLER) so it is decent stuff.

I did everything for $42.70 cents.

I only test drove it for a short time, but thus far it is just as smooth as it was, no shifting issues. In and out of all gears with ease.

I will definitely keep a vigil on possible issues but I find everything to be smooth and quiet thus far.

I would love to run Redline but I am not shelling out $60 for the transmission alone. It has almost 400,000 miles on it.