Thanks Dave,

I saw your post this morning while I was drinking my morning coffee. I had to go to the grocery store a little while ago, so I swung by the Advance Auto Parts store on my way. I bought the last 1 gallon jug of T4 that they had. There were three 1 gallon jugs of T6 on the shelf. That's it. No quart jugs of either T4 or T6, Last time I bought oil there, that rack was full.

The other racks with the normal gasoline engine oils didn't look as well stocked as they normally do either, so it may not be just Rotella.  

 

Last trip to tractor supply, if they had any Rotella, it wasn't what I wanted.
Not sure what it was, but it was in a 2.5 gallon jug.

The local Wal-Mart was completely out of T6 and almost out of T4 a month or two ago when I needed oil for the Vision. However, the wife and I did a road trip this weekend and, when I checked at the truck stops we stopped at, they seemed to have plenty. Maybe Shell is shipping more to the truck stops and less to the regular stores.

Has anyone looked into Kirkland diesel oil from Costco??

I was there today and noticed they had it.  Might have been cheaper in the store.

https://www.costco.com/kirkland-signature-heavy-duty-diesel-15w-40-motor-oil-...

https://bobistheoilguy.com/forums/threads/new-kirkland-15w-40-diesel-engine-o...

Just checked, down to my last 2 qts, good for 2022!
Cheers! no cool emojii

Thinking of you Dave, so I bought a gallon of Rot4T.
Around a dozen more on the shelf in the local wallyworld.

Your truck was made to run 0W-20....and it has babbit bearings.  The clearances in the engine are made specifically for the oil that they recommend in the owners manual...and on the oil filler cap.  You really should run the weight of oil they made the truck for - at least until you get a couple hundred thousand miles on it.

Your Savage was made to run a thicker oil....and it has roller and ball bearings (except for the cam).  You can run 5W-40, 10W-40 or 15W-40 in the cooler months......and if you want you can run 20W-50 when the temperatures are really hot.  The "W" rating really doesn't mean much if you are only running the engine in warmer temps - if you don't ride your bike in freezing weather the winter rating doesn't really affect how your engine starts.  Once the engine is started and warmed up the "W" rating is meaningless.

And......adding thick STP or Lucas really won't extend the life of your engine any noticeable amount.  Modern oils are really good at what they do and they really don't need any additives.

I looked at Mobil1 in O'Reilly's today - the darn stuff is $34.99 for a 5 quart jug!