OK ,LETS GIVE IT SHOT, FIRST OFF THERE ARE PLENTY OF THOSE ENGS THAT DO NOT USE OIL, BUT MOST ARE PRONE TO AFTER ABOUT 60.000 ,MILES, USUALLY TRACED BACK TO A FAULTY EGR
VLV , THANK YOU GM, ALLSO ISUZU , BECAUSE OF THE DESIGN OF THE ENG IN 98 AND LATER HAD VERY SHORT PISTONS , ISUZU FELT THERE WAS NOT ENOUGH ROOM ON THE PISTON SKIRT TO CUT A SLOT FOR OIL DRAIN BACK, LIKE ON THE 92-97ENGS , THEY DO NOT HAVE OIL DRAIN BACK HOLES BEHIND THE RINGS , THEY HAD A LARGE CUT OUT IN THE PISTON THAT GOES ABOUT 1/3 AROUND ON EACH SIDE OF THE THRUST SIDE , SO THEY DRILLED 2 OIL DRAIN BACK HOLES IN THE PISTON RING LAND ON EACH SIDE OF THE PISTON, THINKING THIS WOULD BE OK AND IT WAS IF YOU KEPT THE CORRECT TYPE OF OIL AND CHANGED IT LIKE IT SHOULD BE, SO NOW WE HAVE TWO PROB AREA,S OIL DRAIN AND EGR , AND THAT WAS EASILY FIXED , GM REDESIGNED THE EGR VLV ,
ISUZU FIXED THE PISTONS BY DRILLING 2 MORE HOLES IN EACH RING LAND , PISTONS ARE ABOUT IDENTICAL, THE RING EXPANDER WAS REDESIGNED ALL SO , SO THE WAVY PART IS NOT SO CLOSE TOGETHER, , NOW THE PROB IS FIXED , I WOULD HOWEVER USE NOTHING BUT THE ROTELLA 5-40 DSL GRADE ENG OIL , IT WILL KEEP THE ENG CLEANER THAN ABOUT ANY OTHER OIL , AND YOU WILL PROB SEE ABOUT 25 OTHER [POSTS CONCERNING WHICH OIL IS BEST FOR THAT ENG, ON THAT ACCOUNT ALL I CAN SAY IS THERE ARE OTHER GOOD OILS ON THE MARKET , THIS ONE IN FACT DOES WORK, BUT IT CAN NOT CREATE MIRACLES , IF THE RING LAND ARE ALL READY CARBONED FILLED NO OIL WILL CUT IT LOOSE COMPLETELY, BUT THE ROTELLA WILL CLEAN MOST OF IT OVER A PERIOD OF TIME , NOW CAN YOU FIX THE USED ENG , YES BUT THE PISTONS WILL HAVE TO BE REMOVED , REMOVE THE RINGS AND DRILL TWO HOLES IN THE BOTTOM RING LAND , ON EACH SIDE OF THE PISTON , THEY ARE ABOUT 1.5 MM DIA, AT THE MOST , AND YOU CAN DO IT , IF CARE FULL WITH A HAND DRILL AND A SUPPORT TO HOLD THE PISTONS, JUST DRILL THEM IN THE SAME PLANE AS THE ONES THAT ARE THERE , BUT EVENLY SPACED TOWARD THE THRUST SIDE OF THE PISTONS , THEN PUT IN A NEW SET OF RING S AND KEEP THE PISTONS IN THE SAME HOLE IT CAME OUT OFF, THEY A RE SIZED INDIVIDUALLY WHEN NEW ,