Re: 600w oil
I also think it's important for the transmission oil to be tacky and cling to the gears. I've got an old bottle of 600W from the company that eventually became Macs (Specialty Auto Products I think). Anyway, it is very dark, very thick and it STICKS to everything.
The last 600W I got from Macs a few years ago had the same label explaining what 600W was on the bottle but this stuff is just SAE140 gear oil, thick and slick but no cling whatsoever. I use it in the rear end, works well there.
I like the 600W from Brattons, it is also dark, not as tacky as the old stuff but not bad.
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