Castrol Power1 4T 5W-40 Full Synthetic Motorcycle Oil, 1 Quart, Pack of 6

I am very happy with this oil I "feel" shifting is smoother and summer rides are well sheer protected.However the deciding factor for purchase was this Used Oil Analysis (UOA) which showed this oil after 5000 mileshigh in both moly and zinc since both values go down with mileage for them to be this high after 5000 miles means the virginal oil was quite high in these values - which is a good thing (and why I buy this oil). Other oils can be half these values or less.

I bought this oil as I have been using Castrol for decades and I wanted full synthetic for my new bike ( new to me) and naturally it had to be wet clutch oil.Castrol is a name I've used and trust.

Save some money guys. It has been keeping my Harley running for many years.

Awesome oil. Works great in my 2023 Suzuki DR650. I've tried a few others, namely Shell Rotella T4 and T6 and this Castrol outperforms them. I can tell via shifting. The Rotella would break down / shear quicker so l decided to try this and l found a winner!

Used this for the oil service on my Harley Road King 2002. Works great - the engine starts and stops and powers the bike forward. What more can one say about motor oil?

Good oil.

Good price for V-Twin motor oil but I haven't put it in my bike yet. I was using Red line 20-50w but they're just too damn expensive. If I remember, I'll come back and finish my review.

High quality and very good performance for my bike.