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>> Nahhh, any old 20W/50 slop will do in the old 'uns.
Non-detergent SAE 50 in the 45 (and all other old Harleys) unless you fancy rebuilding the bottom end. Roller bearing engine, see, relies on volume rather than pressure. That's one reason why I distrust Haynes' books of lies, they recommend Castrol 20/50 for Ironhead Sportsters; I followed their advice and it cost me a crank. Stuck to straight 50 ever since and never had any more problems.
To an extent you are right, but I did say you shouldn't move TOO far from the manufacturer's spec. And if you're going to hammer the motor on a regular basis, stands to reason you put the right stuff in.
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