Ha, somehow I found one of Kevin's posts:
"Shepperds latest recomendation is one quart of Redline Shockproof heavy, and the rest Penzoil synchromesh (6 bucks a quart ). Total capacity on a DSM is around 2.5 quarts.
In the EVO he recomends straight penzoil, but it was so think I decided to add half a quart of Lucas Heavy. In sub 60 degree weather it's a bitch to get it into gear until I do a few miles to heat up the fluid. Once it heated up, or on a warm day, it shifts way better than the stock fluid did. Also be aware that many dealerships don't use "stock" fluid, the local Mitsu dealer has drums of Carquest generic fluid
I am inclined to trust Mr Shepperds judgement on this subject, but you can experiement a bit if you have to. You can adjust the mix ratio of the two fluids to account for the changing weather. Less heavy and more penzoil will make it happier in cold weather, but will provide less protection under load."
http://www.automotiveforums.com/vbul...light=bg+fluid
Edit: More from Kevin:
"John Shepperd believes that running the synchromesh straight is too thin to provide enough protection. With all the trannies he tears down I'm inclined to trust his judgement. It changes every year or so, but his latest recomendation for DSM transmissions is 1 quart Shockproof Heavy and the rest Penzoil synchromesh. If this doesn't shift well enough in cold weather, you could increase the proportion of synchromesh to thin it out. In the summer I wouldn't run the stuff straight though.
In the EVO he recomends straight synchromesh, but I don't trust it, and I don't know why the recomendation is different. Last summer I ran half quart of heavy to the rest penzoil, but in cold weather I'm running it straight since it stays thicker, and I'm not racing.
It's more of an art than a science sometimes. Just gather the facts, listen to the poeple that work with this stuff day in and day out, come to some conclusion, and then try it out."
http://www.automotiveforums.com/vbul...ght=shockproof
"I used to run straight 85-90 gear oil in the winter in MA, was a little stiff for the first few miles but no problem. The penzoil is quite thin, like BG, so with only one quart of the Heavy, I doubt you will have any trouble in cold weather.
Keep in mind that the heavy oil is not to improve shifting. In fact it more likely makes it worse. IT is there because when people run straight synchromesh oils that are lighter, there is a lot more wear in the tranny."
http://www.automotiveforums.com/vbul...ght=shockproof
Oh, and apparently all the syncromesh fluids are the same: "Penzoil, Quaker State Synchromesh (Quaker State is part of Pennzoil), Texaco Synchromesh, GM Synchromesh, or AC Delco Synchromesh (part number 89021808). GM Synchromesh retails for about $10 per quart bottle at GM dealerships. Pennzoil Synchromesh is sold at many Auto Zone auto parts stores for about $5 per quart and should be available from Pennzoil distributors."