I noticed that Redline reports their HT/HS numbers based on the ASTM D-4741 method while AMSOIL reports theirs based on the ASTM D-4683 method. Redline seems to be a tad higher for similar oil type and weight.
I wanted to know if Redline is getting higher numbers because their test methodology they are using is different or "easier" to get a higher number?
I wanted to know if Redline is getting higher numbers because their test methodology they are using is different or "easier" to get a higher number?