This is a really interesting read about motor oil. After reading all of this, I started using Mobile 1 0W-30 in all of our stuff that calls for 30W oil. The Toyota gets Toyota 0W-20. Rogue gets either Nissan or M1 0W20.

https://bobistheoilguy.com/motor-oil-101/

cbird805 wrote: ↑

Thu Jun 23, 2022 4:03 pm

So, running 40w oil in a 95 Q45 is ok? I happen to have a 12 qt box of 0w-40 Mobil 1 sitting around. Anyone else doing this? Does warmer or colder climate affect engine oil performance, when using 40w?

0w-40 is absolutely ok, even better than ok.

Its thin enough to be run in winter (0w-xx) and thick enough to be run in summer (xw-40)
Factory manuals mentioned 10w-40 for summer ( and 10w-30 and others...
See page 185 section, 9-22: 10w-40 authorized for all temps above -20 F.
https://www.infiniti-techinfo.com/refgh ... ti-Q45.pdf
(this is for the 1992 but its the same motor as in your 95, a VH45de)

Your 0w-40 is thinner in cold start (which is good) so you could run in in colder temps and it will also work great in the hot summer we are having since its a 40 weight.
best of both worlds.
Also this is the oil that brought me back to Mobil 1, since a few years ago they improved the formulation of their 0w-40 with better lube stock removing the only disadvantage typical of oils with such wide spreads between the first and the 2nd number( I wont get into the why and how, too much writing)

I use Mobil1, 0w-40 in both my Nissan engines right now (a V6 and a V8, both of are follow on Nissan designs to your Nissan/Infiniti VH45de)

Q451990 wrote: ↑

Thu Jun 23, 2022 5:17 pm

This is a really interesting read about motor oil. After reading all of this, I started using Mobile 1 0W-30 in all of our stuff that calls for 30W oil. The Toyota gets Toyota 0W-20. Rogue gets either Nissan or M1 0W20.
https://bobistheoilguy.com/motor-oil-101/

Read it cover to cover. I was always taught those numbers were a straight VI comparison at different temperatures, but never bothered to investigate to the extent I've delved into, say, silicon fabrication. Bob knows a lot more than those long-ago teachers and I stand corrected. Great stuff, tyvm!