This year, changed oil to begin season with Bel-Ray 10W-40. almost immediately noticed positive difference- motor revs out quicker and has more power.
Has anyone else experienced this effect with Motul oil?
WHY would this happen? Thanks in advance for thoughts.
Good narrative... here are my thoughts from 50 years in the saddle...
Are oils are graded by gravity flow, formally called Kinematic
Viscosity (KV) in accordance to ASTM D-445... its important to note
that this test is not a measurement of an oils thickness nor an oils
weight... its a measurement of time required for a fixed volume of oil
at a constant temp to flow under the force of mean old Mr.Gravity...
The rate of flow is expressed in Centistokes (cST)... the lower the cST
number the quicker the flow which usually mean quicker revs and more power...
First up is BelRay 10w40 it's KV or gravity flow measures 14.2 cST @ 100C
Next is Motul 10w40 it's KV or gravity flow measures 13.1 cST @ 100C
So if the numbers are correct (which can change per batch of oil) Motul
flows 1.1 cST quicker than BelRay... but the seat of your pants says
BelRey revs quicker and makes more power than Motul... there is one way
to declare a winner and that is what Bonz mentioned... take a dyno run...
There's definitely room for a bit of placebo effect, anytime we make a
change that we "expect" to impact performance in one way or another.