I went from the OEM fluids in my Harley RKC 103 to Mobil 1 V-Twin to Redline.
Redline in all three holes, the bike shifted more smoothly, much less clunk in the tranny and engine was a lot quieter as well.
The Shockproof for the tranny is a real bonus and if I had to choose one Redline fluid for the Harley above all others, I'd choose the Shockproof.
You can get away with other high quality oils for the engine and run something like Rotella 15W-40 in the Primary, or a 10W-40.
I chose Redline in all three holes because it's a proven synthetic, and for an expensive motorcycle, the extra cost was not a factor.
Redline in all three holes, the bike shifted more smoothly, much less clunk in the tranny and engine was a lot quieter as well.
The Shockproof for the tranny is a real bonus and if I had to choose one Redline fluid for the Harley above all others, I'd choose the Shockproof.
You can get away with other high quality oils for the engine and run something like Rotella 15W-40 in the Primary, or a 10W-40.
I chose Redline in all three holes because it's a proven synthetic, and for an expensive motorcycle, the extra cost was not a factor.
