Castrol 06116 Power1 V-Twin 20W-50 Synthetic 4T Motorcycle Oil - 1 Quart Bottle by Castrol

I'll be damned if I'm going to pay what Indian wants for their 20w40 oil for the Thunderstroke engine. 52,000 miles with this oil and it's been great. Oil changes at 5,000 miles as recommended for the OEM oil, and I never have to add oil in between. Blow by into the airbox is the same as the OEM oil. Cold starting is the same in the winter (mornings as low as 25F). I also ride in 120F-plus desert weather, which is hell-on-a-hotplate, but the bike handles it better than I do. I've even used an IR thermometer on the cylinder heads and seen no difference between OEM oil and this, with hundreds of readings taken at different times and ambient temperatures. Clutch and shifting action are unchanged between Castrol and OEM. I've also used Valvoline's V-twin oil though and noticed no difference, so this is certainly not a religion for me. It's mainly that Castrol as a good V-twin oil and a good high-zinc oild for my air-cooled VW Baja Bug, so I stick with them out of habit.

Harley twin cam 88 seems to like it runs quieter, I think so anyway, like Castrol oil but hate the foil seal on bottle,my advice is to use a funnel with screen! you don’t won’t any mishaps with foil in oil tank.

2005 Harley Road King -- I have been a large advocate of Castrol oil and have used them exclusively in my auto's for over a decade. This is the first time i've tried their m/c formula and 20W50 is the recommended weight for the high torque, high temperature V-Twin. This specific oil is listed as being formulated for use in all three cases (Engine, Primary, Trans) and I used it that way. So far, after about a year of use and ~8k miles I feel the oil works well. I saw no changes in engine temperature, shifting ease, or clutch engagement which is perfect. People making claims that their lifters are quieter or that the transmission shifts easier may be embellishing a little bit but to each his own. I should add that in my specific application my bike has a lot of miles (117,000) and I do competition course riding as well as commuting with my bike. Therefore the bike is getting really hot on a regular basis. As a result i experienced a LOT of burn off with this brand of oil. I replaced three full quarts of oil to the crankcase since my oil change 11 months ago. I will continue to use this brand and recommend it. If i find a better option i may try it next oil change but so far i'm okay with what i have.

as expected, box of jugs of oil

good product, quick delivery, great price