Forums
New posts
Search forums
What's new
New posts
New media
New media comments
Latest activity
Media
New media
New comments
Search media
Members
Registered members
Current visitors
Log in
Register
What's new
Search
Search
Search titles only
By:
New posts
Search forums
Menu
Log in
Register
Install the app
Install
Off-Topic Discussion
Off-Topic Discussion
10w40 or 20w50
JavaScript is disabled. For a better experience, please enable JavaScript in your browser before proceeding.
You are using an out of date browser. It may not display this or other websites correctly.
You should upgrade or use an
alternative browser
.
Reply to thread
Help Support Yamaha FJR Motorcycle Forum:
This site may earn a commission from merchant affiliate links, including eBay, Amazon, and others.
Message
<blockquote data-quote="jestal" data-source="post: 277970" data-attributes="member: 477"><p>Split the difference and use the Delo/Delvac/Rotella 15W40. Close enough.</p><p></p><p>The "cold" viscosity is primarily related to cranking speed when the engine is cold so the difference in the "cold" viscosities is much less important than the "hot" viscosity rating. If you have to decide between 10W40 and 20W50 I would choose the 10W40 as the 40 "hot" viscosity rating matches the Yamaha recommended oil specification (20W40) for "hot" oil at 40. The 20W50 would run consistently thicker than the recommended oil when the engine is at operating temperature...which is most all the time....so it would be less desireable than the 10W40. Unless you are trying to start in sub-freezing temperatures regularily the cold oil rating difference between 10W and 20W is pretty much moot.</p></blockquote><p></p>
[QUOTE="jestal, post: 277970, member: 477"] Split the difference and use the Delo/Delvac/Rotella 15W40. Close enough. The "cold" viscosity is primarily related to cranking speed when the engine is cold so the difference in the "cold" viscosities is much less important than the "hot" viscosity rating. If you have to decide between 10W40 and 20W50 I would choose the 10W40 as the 40 "hot" viscosity rating matches the Yamaha recommended oil specification (20W40) for "hot" oil at 40. The 20W50 would run consistently thicker than the recommended oil when the engine is at operating temperature...which is most all the time....so it would be less desireable than the 10W40. Unless you are trying to start in sub-freezing temperatures regularily the cold oil rating difference between 10W and 20W is pretty much moot. [/QUOTE]
Insert quotes…
Verification
Post reply
Off-Topic Discussion
Off-Topic Discussion
10w40 or 20w50
Top