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I'm sure the Castrol product is excellent. That said, I recommended Royal Purple because many BMW manual transmission owners swear by the improved cold shifting with the Synchromax product.
Filippo
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2011 35i MT Atacama ... lots of bits. Full Öhlins TTX custom suspension. Build thread.
Build sheet. Currently finishing suspension, fuel, ignition system with Barry Battle @ 3DMMotorsport. |