Originally Posted by edhackett
Originally Posted by edyvw
Originally Posted by 92saturnsl2
Unless the higher HTHS viscosity is required, I try to avoid xw-40's in the winter. A 5w-30 would be thinner in all but the most extreme temperatures than a 0w-40 would.
That said, if I had a sump full of M1 0w-40 that had plenty of life left in it, I wouldn't get rid of it.
That also depends which 5W30.
FS s almost W30 oils as KV100 is 12.9.
I sent a virgin sample of FS 0W-40 to Blackstone for viscosity measurement a couple of months ago. It came back at 11.74, so not almost a 30, it was a 30.
That pretty much sealed my long standing thought that M1 0W-40 sheared to a 30 just pouring it from the bottle.
Ed
11.74? Geeez, that is big discrepancy from what they state.
Though Blackstone last year or years after that warned that due to their methodology VOA is not quite accurate.
Did you do UOA?