5w-40 in a Twin Cam 88?

I believe most people's problems is their clutch is out of adjustment, and they have too heavy an oil in the primary. The heavy oil creates drag on the clutch plates, and they don't quite release from each other. For the trans, I use auto parts brand trans gear oil 70/90 wt works fine for me. This is a simple system that doesn't need the most expensive lubricants on the planet to perform normally.,,
Nail on the head.
They're viscous-ly coupled together while cold. People need to use something else and make sure the clutch is adjusted properly.
 
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