Amsoil Motorcycle Oil - why is API rating outdated?

[ZeeOSix]

Same thing read for Kawasaki on an old article that did with the superbike machine on WSBK scene, use 0-20 and engine send to Japan for rebuild / inspection, today they claim run Elf HTX 3835 (5/30) or HTX 3830 (0/30) or Motul 300 V2 0W-30.
a special version of this Motul also exist as HRC kit part for CBR 1000 RR SP , Motul 2172H or 2376H

And what is the HTHS viscosity of those oils? That's what really matters. There can be xW-30 oils that are on the thick side of a 30 grade, and due to formulation have a higher HTHS than the ordinary run of the mill xW-30 motor oils. Also, if a motorcycle has an effective oil cooler it would help by keeping a thinner xW-30 oil from thinning down too much in use and keep the MOFT between moving parts adequate.

 

[oil pan 4]

'Weaker' is a term borne of ignorance. The newer API ratings require lower wear than the older ones, and they achieve it. They couldn't do that if they had 'weaker' additive packages.

Nowhere did I mention anti wear additive.

 

[TrialKid]

And what is the HTHS viscosity of those oils? That's what really matters. There can be xW-30 oils that are on the thick side of a 30 grade, and due to formulation have a higher HTHS than the ordinary run of the mill xW-30 motor oils. Also, if a motorcycle has an effective oil cooler it would help by keeping a thinner xW-30 oil from thinning down too much in use and keep the MOFT between moving parts adequate.

because I can’t open the tech sheet of HRC specs Motul (something conflict today) , if I remember correctly upside down is somewhere like the Elf one HTX 3830 ,0-30 (don’t remember if gives 40-42 at 40C and 10.5 at 100C)
HTX 3835 is neck to neck to be on Hi 30W and almost to Low 40W

Can’t find newer tech data , but on Total Energy give same SDS until today

 

[ZeeOSix]

because I can’t open the tech sheet of HRC specs Motul (something conflict today) , if I remember correctly upside down is somewhere like the Elf one HTX 3830 ,0-30 (don’t remember if gives 40-42 at 40C and 10.5 at 100C)
HTX 3835 is neck to neck to be on Hi 30W and almost to Low 40W

View attachment 248840

View attachment 248841

Can’t find newer tech data , but on Total Energy give same SDS until today

The Elf 5W-30 is nearly a 40 grade with a KV100 of 12.36 cSt. And it also has a higher KV100 and HTHS than the Elf 0W-30. If you're going to run a xW-30 grade, then run the one with the highest HTHS, or just run a 10W-40 grade.

 

[Bonz]

When the oil is basically a 40 grade, even though it says 30 grade on the bottle, you're running a 40 grade. Not a 30 grade. At that point, a 10W-40 would be a perfect alternative if we want to get down to the nitty-gritty.