Spectro Performance Oil SPE-R.HDPCO Heavy Duty Primary Chaincase Oil 85w 1 Quart Bottle (946ml) for Big Twin

Super smooth gear changes .

My 2023 ,M8 LOWRIDER S, 117, runs super smooth with SPECTRO PRIMARY OIL , PENRITE HPR30 20W60 Engine OIL , and PENRITE 80W140 PRO GEAR TRANSMISSION OIL .

Spectro oils are great products, been using Spectro oils for 14 years now.

Spectro Primary oil

I have been using Spectro Primary Oil for over 10 years in 2 of my bikes, one being a CVO, it has reduced the clunky gear change and most the time gear changing is smooth with no clunking. Oils holds up well with very little clutch particles on drain plug at oil changes.