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Great post. Are the drain and fill plugs the same on the 328 6sp? IIRC, its a Gertrag while the 335 has a ZF. As to replacement fluids, Synthetic D4 is the best match for the factory fill and provides the smoothest shifting, particularly in cold climates (Redline or RP are excellent). For better lubrication and protection, Redline MTL will serve better, BUT it requires slow hands till the tranny warms.
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