Oil is like a Religion you know.....
some get it and some don't
I use Redline products Never One in all three holes.
IMO,,,,Tranny's are made to use GEAR OIL..
I use 20/50 Redline in the motor
MTL Redline in the primary
ShockProof Heavy in the tranny
Never Ever any metal on the tranny plug... I went 18,400 miles on the ShockProof tranny lube... Still no metal on the magnetic plug,,,, NONE....
I usually change the engine oil at max of 4000 miles and primary at the same time. I do use HD oil filter, Jagg 6 row oil cooler mounted on my left down tubes on my 09 KING...
Hot here in Az...
signed....BUBBIE