(Note : excluding additive packages)
There's a lot of talk on grades, low, mid, high 30, low 40 etc, and whether an engine knows the difference between a super low 40, and a super high 30.
Then we all look at the HTHS number to determine how good our prospective oil is.
So, is a crappy xW-40 has an HTHS viscoscity of 3.6. and super duper xW-30 has the same 3.6, does this mean that at THOSE operating conditions, the engine knows no difference ?
Basically, does HTHS ultimately determine the mileage potential, and inversely affect wear ?
There's a lot of talk on grades, low, mid, high 30, low 40 etc, and whether an engine knows the difference between a super low 40, and a super high 30.
Then we all look at the HTHS number to determine how good our prospective oil is.
So, is a crappy xW-40 has an HTHS viscoscity of 3.6. and super duper xW-30 has the same 3.6, does this mean that at THOSE operating conditions, the engine knows no difference ?
Basically, does HTHS ultimately determine the mileage potential, and inversely affect wear ?