Originally Posted By: Roob
Not entirely sure I would agree.
In Canada many Honda/Acura dealers carry and use the Idemitsu ( I believe) GF4 Honda 0w20.
It has a Vi of 197 and a strong add pack with a ton of moly and should be good for about 10k. I had a great Convo with an employee of a Honda dealership lately, their bulk oil is the Gf4 high vi Honda oil. He always gets a laugh when people ask if they have M1 and he gets to explain the specs on both oils.
So that being said the Op would have great results using that if it was easily available. If not then I would suggest Sustina vi229, then the new Mazda with moly oil VI 221, then TGMO VI 214 over Mobile 1.
M1 is a great oil but I won't be using it until they increase the VI to over 200.
VI is simply a mathematical product of the change in viscosity between 40 C and 100 C. A high VI doesn't necessarily translate into exceptional performance at truly low temperatures. As is the case with most things, a single metric doesn't tell the whole story; your engine won't notice the difference between the two.