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RT, then by your logic why not use MTL in auto trannies? The spec is for ATF, and taking advantage of new technology means using Mobil-1 ATF instead of dino ATF. No motor oil or gear oil should go in there. I haven't heard of anyone who has used alternate (non-ATF) fluids and been happy with the results. Most people find synthetic ATF to be a tremendous improvement over dino Dexron. Incidentally, what fluid did YOU put in your custom W123 manual?
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