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If it's really filthy, flush with 10-20 quarts of non-synthetic (no kidding). If you're using synthetic, first use the non-synthetic. You really don't have to use the "best" fluid on the market. Just get whatever is on sale. Usually you can find Shell or something at around $1.20 a quart, which saves you a lot of money over Castrol or whatever, which costs more.
Then, drive it around for a few hundred miles of mixed driving with some good highway miles thrown in, with the clean fluid.
Then, flush it with 10 quarts of synthetic. Check figures for 960 as I don't know those off the top of my head.
And NOW you have really clean fluid, having flushed most of the crud out of the system with the new (now old) fluid. That leaves a REALLY clean system for the synth.
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1992 940 wagon, low miles as well as others.
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