I run the 5-30 9000 and really like it. I usually buy a case or two from the shop I used to work at. They run the 5-40 9000 in all the egr diesel motors in the fleet. I still get a great discount through them. I'm also lucky because the co-op by me carries a wide range of their products. Last time I was there the 9000 oils were around $6 a quart