I was just on the Rotella forum. The Shell technician just announced that Shell Rotella synthetic 5W-40 is now a CI-4 rating. The new formulation is anticipated to be in the stores in mid January. Good news for the 2003-04 trucks.
A forum community dedicated to Chevrolet and GMC diesel truck owners and enthusiasts. Come join the discussion about duramax engines, performance, builds, modifications, classifieds, troubleshooting, maintenance, and more!
