Home
What's new
Latest activity
Authors
Store
Latest reviews
Search products
Forums
New posts
Search forums
What's new
New posts
New listings
New products
New profile posts
Latest activity
Members
Current visitors
New profile posts
Search profile posts
Log in
Register
Cart
Cart
Loading…
What's new
Search
Search
Search titles only
By:
New posts
Search forums
Search titles only
By:
Menu
Log in
Register
Navigation
Install the app
Install
More options
Change style
Contact us
Close Menu
Forums
Cobra Forums
The Terminator
Engine/Tuning
Facts About Royal Purple 5W-20 XPR Racing Oil
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
Message
<blockquote data-quote="UnleashedBeast" data-source="post: 10444327" data-attributes="member: 112023"><p>Here is a UOA of Amsoil Dominator 15W-50 after three weekends of circle track racing. </p><p></p><p>[ATTACH=full]157921[/ATTACH]</p><p></p><p>It still had TBN readings of 7.43, and this means in a street car....you have a lot of usable additive remaining in the oil (1.0 or lower is critical level). The virgin content was probably about 8 to 8.5 IIRC. IMO, when used in a street car, this lubricant would be good for a 10,000 mile change interval.</p><p></p><p>*Ignore the flagged lead ppm content. That's due to leaded race fuel, not an internal engine failure.*</p><p></p><p>For comparison with Amsoil top tier street oils, they have 11.5-13.1 TBN content. </p><p></p><p>IIRC, Royal Purple street oils have 8 to 9 TBN content, which is about the same as RP and Amsoil racing lubricants.</p></blockquote><p></p>
[QUOTE="UnleashedBeast, post: 10444327, member: 112023"] Here is a UOA of Amsoil Dominator 15W-50 after three weekends of circle track racing. [ATTACH=full]157921[/ATTACH] It still had TBN readings of 7.43, and this means in a street car....you have a lot of usable additive remaining in the oil (1.0 or lower is critical level). The virgin content was probably about 8 to 8.5 IIRC. IMO, when used in a street car, this lubricant would be good for a 10,000 mile change interval. *Ignore the flagged lead ppm content. That's due to leaded race fuel, not an internal engine failure.* For comparison with Amsoil top tier street oils, they have 11.5-13.1 TBN content. IIRC, Royal Purple street oils have 8 to 9 TBN content, which is about the same as RP and Amsoil racing lubricants. [/QUOTE]
Insert quotes…
Verification
Post reply
Forums
Cobra Forums
The Terminator
Engine/Tuning
Facts About Royal Purple 5W-20 XPR Racing Oil
Top