Thats what oil I use, It is the best better that royal purple and cheaper around here. The PENETRO 90 spray lube is the best if you buy a can you will never buy wd40 or anything else. I've seen motors that were locked up from sitting with water in them get freed up with the spray and start and run just fine. I wouldn't suggest running over 7 or 8000 miles without changing the oil but I do know of one engine a guy has that has about 90,000 on it with one oil change with Schaeffer and still running strong and its diesel.
The only down fall is that if there is no place around you that sells the oil then you have to order straight from Schaeffer and they have a $300 dollar minimum order