My father started selling lubricants in the mid 1930's and I still sell lubricants. Almost everything that is petroleum based is backordered. I haven't looked at the automotive department in a while so I don't know what they have in stock. Right at the moment I can't get any soda in glass bottles, no plastic cups for fountain drinks, air filters have tripled in price and the list goes on. I lived through the shortages of the 1970's, but it is nothing like what is going on now. I have been using Mobil One 15W50 in all of my older gasoline engines for about 10 years and most of them I haven't changed in 10 years. I am currently using Mobil Delvac 15W40 on all my Diesel engine. I am strongly considering the Cummins recommended Valvoline 15W40 for my Diesel engines. I currently change oil every 15,000 in my Cummins powered Internationals but I think I could save money by switching to synthetic and extending drain intervals. But for my old GMC gas engines, my 1962 Farmall I like the Mobil One 15W50 synthetic. It was actually developed for racing engines, etc. but it does just fine in older looser engines.
