You would not want the 5w30 if year round if you expected temps to get above 90. But they have a 5W40.

A pal was stationed in the Air Force in Alaska. Was so cold in winter that block heaters did not work for trucks parked inside what passed for shelters. They would drain the oil, and keep it in a big pot on an electric hot plate all night, then pour hot oil into truck to start.

 

I live in Idaho and I just run Rotella 15w-40 year round.

 

Agreed, it's supposed to be very cold this winter... I always run amsoil synthetic(after a brief unsatisfying stint with rotella), runs all winter...

 

I just run Rotella 15w-40 year round in up here Boston, not a synthetic fan.

 

Im assuming you dont have an oil pressure gauge. Ive been running Rotella 15w-40 for the last year here in WA. I installed the gauge back in June and after about 5 min of drive time my idle pressure is between 15 and 20 psi. So I think next oil change ill be switching to the 10w-40 for the fall through to mid winter. Im affraid the 15w-40 will take way too long to reach an efficient operating temp and the idle pressure will be higher than desired.

Now I just need to find someone who carries the stuff. Most places only seem to carry the 15w-40

 

What is your oil PSI at 2500 rpm? What would you like it to be at idle? What do you consider too high at idle?

 

Why is everyone passing around the communion plate for Rotella?

I thought Royal Purple was da' boss? Am I the last one to the dinner table and figure out the RP is RIP?

Planning on 5-40 RP next month; Bah-stan can get "wicked" cold. (Cheap attempt at a typed Boston accent).

 

Being most older Rovers belong to the flat tappet tribe, ZDDP is good to have. Rotella outweighs Royal Purple in that category, unless you get into the RP racing oils. As dirty as the old Buick engine is, changing oil at 3000 - 5000 with RP can be pricey. As wonderful as the oil is, there is still some swarth in the oil, and having extended drain interval just allows more time for it to work on things. On the other hand, the DIY guys in the land of ice cubes have to plan for an oil that will get them thru to spring time, if no garage available. Shade tree work under two feet of snow at -15 wind chill would make you get out the long handles.

RP is a quality oil, but this is a old Buick engine, not a bimwah motah.

 

Buzz,
Im at 50 psi at 2500 rpm. I dont think my current psi at idle is too high at all, at least not right now. I was considering the switch because of the length of time it may take the 15w-40 to reach a good operating viscosity at 3am(when I go to work) in the middle of winter. Im 2 min from the highway and Id like to know that my engine is getting nice and lubricated :/ when Im accelerating to 60.
Some people might not think about these things, but I cant help it. I get obsessive(I should be in bed right now, but im on here).

 

They have 5W40 Rotella. I'd let it warm up a little before rolling.