Reasonably estimating HTHS values

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Their tech just emailed me the value yesterday afternoon. The bottles have been redesigned, perhaps there was a formula change? RP is very secretive about certain aspects of their products. They won't even disclose certain data about XPR.
 
Originally Posted By: dparm
Their tech just emailed me the value yesterday afternoon. The bottles have been redesigned, perhaps there was a formula change? RP is very secretive about certain aspects of their products. They won't even disclose certain data about XPR.


Now that's interesting. Can you ask them about their 0w40 HTHS too?
 
Just sent it. The 5w30 is API SL, and the 5w40 is API SM. I'm thinking there was a change to the 5w40 after all.
 
Originally Posted By: dparm
Just sent it. The 5w30 is API SL, and the 5w40 is API SM. I'm thinking there was a change to the 5w40 after all.


Their 5w40 and 0w40 have been SM for a while. Since inception maybe.
 
Originally Posted By: dparm
Tech guy says 0w40 is still 3.6.


I've never seen a 5w40 have a lower HTHS than a 0w40
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