5.7 Hemi "issues"?

My brother bought a 2500 HEMI Ram new in 2003. If it could be broken, he would be the one to do it. To date, no problems. The first day he had it, he was doing burn outs in my parking lot! I have heard that you better use the oem reccomended wt oil on the newer ones with cylinder deactivation. I'm in the used car biz. if there is trouble with a certain model, you will find out about it quick. Try finding a GM 5.3 that doesn't knock or one that has a workig fuel gauge.