Castrol Power1 4T 10W-50 Full Synthetic Motorcycle Oil, 1 Quart, Pack of 6

Bike runs smooth. Good oil I noticed that the newer version is rated at api sn vs the previous was api sl.

Good oil at a great price.

Perfect for my motorcycle

Castrol Power1 4T 10W-50 Full Synthetic Motorcycle Oil is a premium lubricant that is designed to meet the demanding needs of high-performance motorcycles. This oil is formulated with advanced synthetic base oils and Castrol's proprietary Trizone Technology, which provides superior protection for the engine, clutch, and gearbox.Castrol Power1 4T 10W-50 is a shear-stable oil that maintains its viscosity under extreme conditions. This helps to ensure that the engine is always properly lubricated, even when riding at high speeds or in hot weather. The oil also has excellent anti-wear properties that help to reduce friction and wear on engine components.In addition to its outstanding performance, Castrol Power1 4T 10W-50 is also a very clean-burning oil. This helps to reduce the build-up of deposits in the engine, which can lead to reduced power and performance. The oil also has excellent anti-corrosion properties that help to protect engine components from rust and corrosion.Overall, Castrol Power1 4T 10W-50 Full Synthetic Motorcycle Oil is a premium lubricant that offers outstanding performance and protection for high-performance motorcycles. This oil is a great choice for riders who demand the best possible protection for their engines.Pros:Formulated with advanced synthetic base oilsCastrol's proprietary Trizone Technology provides superior protection for the engine, clutch, and gearboxShear-stable oil that maintains its viscosity under extreme conditionsExcellent anti-wear propertiesClean-burning oil that helps to reduce the build-up of deposits in the engineExcellent anti-corrosion propertiesCons:None

My Ducati Monster 696 calls for 15W-50 Shell Advance Ultra, which is not available in the US. I've looked for equivalents and tried numerous different oils. I found a few like Silkolene that are JASO MA (for wet clutches) and xW-50 weight to protect the air cooled engine during the summer. However, with a 15W-50 or 20W-50 synthetic, the Ducati engine has a really hard time starting in cold temperatures. I always felt that a synthetic 5W-50 would probably be the best way to go for the Ducati engine by offering low viscosity in the cold to assist with cold starts, and the 50 weight to protect it during hot weather usage. The closest I could find is the Castrol 10W-50, which actually helped my cold start issue. I was able to start the bike at 19F ambient, which is actually too cold to ride comfortably unless you are a diehard biker and need to get your 2 wheel fix during the winter.What I still need to test is hot weather speed shifting. I tried Shell Rotella T6 5W-40 synthetic, which supposedly meets JASO MA, but caused my clutches to slip badly during WOT speed shifting. With the T6, I suspect the xW-40 was too light of an oil to prevent the clutches from slipping/grabbing. Once I drained the T6 and poured in M1 V-Twin 20W-50, the clutches worked properly. The M1 20W-50 is actually robust oil, but it is too thick for reliable cold starts, even when the ambient temperature is about 40F.Overall: 5/5 stars, actually a great price for what appears to be a robust oil. I wish they made more motorcycle oils in different weights like 5W-50 and 10W-50 in the US. I am hesitant to try 10W-40 in my Ducati because of my experience with the Rotella T6 5W-40.

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.