Sorry
sbc350, it’s just the “Search Nazi” in me that needs to put a reminder in a third of my posts. I didn’t even see your name as I glanced through the thread.
I guess I see this forum as a better resource if it has fewer, but more comprehensive threads. So, if those old threads didn’t answer your question, please resurrect them with your new question. In other words, keep fewer threads going longer.
What year machine calls for a 20W50? I guess I’ve just become biased against this stuff, especially in mineral oil form. Seeing as it’s a obsolescent grade no new cars call for anymore, I figure that the oil companies aren’t necessarily putting their best additives and VII in these oils. I’ve also heard that his grade is rather VII heavy anyway and is prone to shearing and sludging. I have similar biases against mineral 10W40s and UOAs on this site shows this stuff dropping out of grade rather quickly.
I’ve become a fan of the 15W40 oils over the past couple of years and I’m running Schaeffer’s 15W40 S7K in our 1983 Honda ATC 200E (Big Red). Runs great and no problems with the clutch except I can’t get the adjustment of the shifter quite right so there is a great deal of slack in the arm movement.
However, a 15W40 might not be ideal depending on the wet clutch material, the friction modifiers used by a particular brand, etc …
’bike, that oils sounds pretty impressive. Have any info on the “synthetic” base oil?
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Bror Jace