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Your assumption is absolutely correct!!!
I've been running MT-90 all summer and have hated every shift since I put it in. My initial goal was better cold performance, which I got, but the overall performance is poor. It is too slippery.
Just yesterday I switched to Royal Purple 75-90 with a little Synchromax to top it off. It's about 1000 times better. In fact, it's almost as good as a 5-speed.
If you're dead set on staynig with Redline, I've heard the Shockproof oil is better suited to our transmissions.
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