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I agree cattlerepairman. That is why I said I did not think running 80/90W oil is bad. I ran it for decades in my trucks and in trucks I serviced over the years. It was after the "great oil debate" that I finally changed my mind. (last sentence removed)

I forgot to mention this. I have worked for over 4 decades in heavy truck maintenance with my "specialty" being transmissions. I have seen what happened to you many times before. Someone is running a particular oil and then decided to change to a modern "synthetic" oil and all "Hades" breaks...

Well Gerhard you seemed to have missed the "great oil debate" a few years ago now. I was a firm believer in the good old 80/90W gear oil. I used them for decades in many shops and dealerships with no problems. Then when I got into a debate with "Welldigger" and several others I ended up calling...

I have never used Lucas oil before. From what I have read about it, it doesn't stand-up to the major gear oils. Shell, Delo, Mobile are major suppliers to transmission manufacturers . I would stay with them.

Yes the 50W oil would be better. That is why the article Floridianson mentioned also had the "Delo Syn-Trans XE" SAE50 oil at the end.

That is an excellent oil, though I would go with the "Delo Syn-Trans XE" SAE50 gear oil myself. Like I said earlier all the major transmission manufacturers recommend at least a 50W oil.

Come on Frank. Don't lead anyone astray here. You know better. There is tremendous differences between a "engine" oil and a transmission gear oil. Especially one that works with "yellow metals" . You didn't even get into the whole "shear" and "compression" values of the oil which are vitally...