Castrol Power1 4T 5W-40 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.

Great oil, great price!

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

At first I was debating between Castrol and MobilI went with Castrol, the oil seems to be good and i feel the engine run smooth although I would actually know how the oil performs after putting a few hundred miles on it for now it seems to be doing its job and minimizing engine noise. Would recommend it hands down

Seems to be okay. Engine runs smoother etc.I have to use for awhile to fully test out.Ask me in six months.Oil: Castrol: Power RS V-Twin 4T 20-50 Full Synthetic:Story: Since purchasing used a year ago with about 13,500 miles I have only used the Kawasaki Red label 10-40 oil, of which the previous owner had used. With the cost of oil changes and recommended from others to try a synthetic oil. Doing research on the internet as I am a Pennzoil lover from years back, however I researched Castrol and decided that it appeared they had the best development and etc. of oils. I just a couple months ago put Castrol in my pickup. With very hot climate here in Arizona I thought that I needed the extra protection and going to a 20-50 as other riders in Arizona use. Following maintenance record.Oil start up and performance:After installation of the new Castrol oil and new KN filter. I started bike ran for a minute and shut down. I let it set for five minutes, then started again. It still rattled a bit louder then normal but left it run the more it ran the more quite it got. I left it run for about fifteen minutes and it really got smooth running and nothing rattling.Putting the VN 2000 in perspective: 2053 cc, 125 cu in, 116 hp. 103MM (better then 4 in diameter x about 5 in stroke piston) or 62.5 cu in per piston / or 62.5 / 61.03 cu in in a liter = 1.02 liter. 141 ft lb of torque @ 3000 rpm.Now lets compare to what we are used to: Most probably the most powerful muscle car of that era was the Dodge 440 magmum: 440 cu in or 7.2 liter, 375 hp @ 4600 rpm, 480 ft. torque @ 3200 rpm, with a: 4.32 inch piston with a 3.75 in stroke. Curb weight 3770 lbs.I figure my bike with the trailer hitch and other items wet weight maybe 900 lb.In perspective: 2 cylinders x 4= so: 125 cu in = 500 cu in, or 8.16 liter, 141 x4= 564 ft lb of torque, 116x4=464 hp. That is more torque then a lot of hyper charged Dodge Cummins pickups pulling big trailers.By weight you have a bike that is: 60 cu in larger, 84 ft. lb of more torque, 90 hp more then the Dodge charger with a 440 magnum. You should have the picture now. The most powerful street cruiser made.After a 2-3 days of riding brief short trips to the grocery store etc..Test ride # 1: OilCruising south on Higley to the 60 right turn, about 15 mph, pour it on a slight bark then smooth, gear two, shifter slides in smooth as silk. Give her more gear three, didn't even feel it shift, gear four no click it just went there, gear five the same, trottle full the engine just kept going, running so smooth unbelievable, what the heck I didn't know this had a automatic transmission. At the end of the ramp I looked down I was going 117 mph. Tire review to follow later. After going maybe 8 miles west on the 60 at varying speeds. I turned off the 60. Up to the stop sign I let her settle down and every time now. Back completely off the throttle and she just sits there a very slow rpm guessing about 200 rpm (there is no tachometer) less then with other oil. Those big four inch pistons just sit there thump, thump, thump, green light, very little to the throttle 5 seconds of good barks and she smooths right out with a steady easy rumble. I pull up to stop sign and a loud sounding Harley is in the lane next to me, and the rider wonders what that thump, thump, thump is! I am guessing he thinks I am going to blow him away with sound after the green light. Sorry only five seconds.Analysis: I am guessing that the ECU is sending a signal that there is less power is needed because everything is running so smoothly because of the oil. Now because of going to the 20-50 weight I will purposely just let it idle longer on start up to make sure that I have good oil circulation and coating before I take off. The shifting (same oil works in the transmission) is so smooth, I don't hear one click and very little pressure.

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.