Let's talk oil viscosity
Posted: Fri Jul 10, 2015 9:27 pm
Here's the recommended oil viscosity for your XJ600 & Seca II:

Yamaha recommends 10W30 and 20W40 depending on temperature. Unfortunately for us, the 20W40 oil is no longer available. Common viscosities for engine oil are 10W40 and 20W50. I use both in my XJ's. Here's a revised oil viscosity table showing what I think you should use:
What are your thoughts on this? What do you use, viscosity wise, and when? Any recommended reads on current oil standards?

Yamaha recommends 10W30 and 20W40 depending on temperature. Unfortunately for us, the 20W40 oil is no longer available. Common viscosities for engine oil are 10W40 and 20W50. I use both in my XJ's. Here's a revised oil viscosity table showing what I think you should use:

What are your thoughts on this? What do you use, viscosity wise, and when? Any recommended reads on current oil standards?