All in all, I think I'll continue with the Redline GL4. Some of the older GM transmissions also require special oils because of the brass in them it's a manufacturer recommendation. (The mating gear was phenolic, which should have worn faster than the brass, but it didn't wear at all.) I was astonished couldn't blame the wear on anything else. On the other hand, I once used a silicone-based grease on a brass worm gear in a Healey Sprite speedometer, and it wore out in a few months. My Porsche transmission has a certain amount of brass in it, mostly in places with little wear, though, and the manufacturer's recommendation is for ordinary oil.
In all honesty, I don't know how serious the "yellow metal" problem is in transmissions. And, of course, there's the well known phenomenon: if you expect to perceive something subjective, you will. After all, many people don't understand that transmission oil does wear out and must be replaced periodically. The problem with all these anecdotes is that you never know what they're compared to the guy might have been using the wrong oil previously or had not changed it for umpteen years. I think we all have heard people say that they changed gear oil to some super-duper stuff with a great reputation, and the transmission started working perfectly, attracting good-looking woment, and frying their eggs in the morning. The only ones benefiting from it is the ones getting your money! Test, Put a new piece of brass in a bucket of sulfur based oil and come back in 20 years and see if the piece is still there, the piece will still look like new. It's just like adding "lead substitute" to your gas, snake oil is all it is. I wouldn't use it in the Winter, but I don't drive my old cars in the Winter anyway.
To take piece of 60 year old brass out of a transmission and say it fell apart because the wrong oil was used is a little ridicules, hell it's 60 years old, how long is a part supposed to last! I'm thinking of droping the Red Line out of mine and dumping some 140 in there to see if first and reverse quiets down a bit. There,s not a mechanical transmission out there that will fall apart after a rebuild from 60+ years of use, during our life time, regardless of what oil you use in it as long as it's the proper viscosity. I put Red Line in mine just to see how it reacts, I notice no difference in shifting or noise reduction. I got into American antique show cars in the 60s and in all those years I've never heard so much concern for what goes in a transmission, especially because it has some brass in it until I got into redoing British cars. Built engines, gear boxes, final drives etc. We were into the racing game pretty heavy. You know, I've been around for quite a few years, actually since 1938 and yes I have Red Line in my TF gear box, but ever since I was 8 or 9 years old I've been around the mechanical end of vehicles with my dad. Jul 20 Headlamps & Side Markers Repla.Jul 23 Classic Car Stereo That Will M.Jul 23 Replacing Hydraulic Seals In M.Jul 28 Door Window And Vent Window Re.Sep 17 GASoutheast British Car Festival.Aug 28 NYAutumn Sports Classic Super C.
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