The sh and si oil are intended for pre 08 powerstroke engines. You can use the sj-4 oil but the oil change interval is cut in half. Needs to be changed at 2500 miles instead of 5000 miles. Has something to do with the new ulsd fuel. Hope this helps some, and if I'm not 100% correct, I'm sure someone will let me know :nod:.hey there, new guy again, I recently bought a 2004 f250sd with a 6.0l. The trucks owners manual says I need sh or si oil. I just changed the oil and used sj-4, rotella t. is this ok. oh, it was 15w45. thanks
:hehe::hehe::hehe: That is to funny...Use amsoil, and double the service interval to 10k. They say it will go 25k, but apparently the way I drive it doesn't last that long. You should also notice a little mileage increase when switching over.
I put amsoil in everything that holds fluid. When I switched my lawnmower over to amsoil, my grass became much greener, and I haven't had any clover or ant problems since. I believe Amsoil is the answer to world peace.
I found a PDF with the results of something like 600 oil analysis samples. Seems like you might be interested in that sort of thing, so let me know and I'd be glad to send it to yaI've been happy with my 5-40 Rotella Syn. So far I have about 4k on it and it's still in good shape, MPG's haven't dropped and it's not nasty looking. That's my free oil anaylysis. Look, feel and MPG's. But I can't see myself running it longer than 6-7k.