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Personally I don't use synthetic, although that's likely to change in the near future. The last car of mine that I flushed, I ran a case through the system. I use whatever decent brand that I can get off the shelf. Wholesalers don't offer decent fluid prices because they deliver, so I just buy at wherever is having the sale.
If the fluid is dirty (a customer of mine comes to mind) it might take as many as 20+ quarts before you see clean fluid. If so, keep pouring.
If I were going to change to synthetic, personally I'd spend the extra fourteen dollars on a case of dino Dexron III, and flush it out first with that, then drive for a few hundred with the dino oil in it to circulate the clean fluid and get any residual junk out of the system. Because I've had a bunch of thread problems with AW70 and AW71 drain plugs, I've been shying away from them. Often they're frozen or they've been crossed by some moron at a previous change.
Last time I did my own car, I used Formula Shell, because it appears to be the same product bottled under the Havoline name, but costs 30-40 cents less a quart. Plus I did the power steering system which is another thing I do when I do trans flushes. Usually I buy a couple cases at a time, or more.
I don't use a flush kit, rather I use a piece of fuel hose of the proper diameter to fit tightly over the top nipple on the radiator, where the trans line attaches. I put a measured bottle right in the engine compartment and watch it fill as I run the engine. I've never leaked a drop doing transmissions, I sometimes avoid draining the pan. I like to have a new gasket for the drain plug as well, for the times that I have drained it.
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1992 940 wagon, 72k
make people envious; smile often.
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