Members with the Cummins 6.7 ISB engine on Freightliner chassis report confusion over oil capacity, as the manual often lists 12 quarts, but the dipstick reads low even after filling to that spec.
The Cummins ISL 425 HP (often the ISL9 or ISL 8.9L, depending on year) is generally a strong, reliable engine, but like any heavy-duty diesel, it has some known issues worth factoring in—especially at higher mileages.
Hello fellow RAM owners. Steelbob611 / Texas here. I am new to this forum and a first time RAM truck owner after a lifetime of being a GM truck and SUV owner. Made the switch and purchased RAM 2500 Crew Cab 6.7 L Cummins Diesel. Delivered October 2024. I have put about 1600 miles of gentle break...
Transfer Case Seal Failure - 2024 RAM 2500 6.7 L Cummins Diesel
Members discussed the challenges of sampling and replacing Organic Acid Technology (OAT) coolant in coaches with Cummins ISB 6.7 engines and Freightliner chassis, especially when radiators lack a pressure cap or petcock. Several RVers confirmed that most modern surge tanks are in circulation and suitable for sampling, but confusion remains about whether to test from the surge tank or radiator ...
Best Practices for Testing and Replacing OAT Coolant in Cummins ... - iRV2
I have a 2025 RAM 2500 with the 6.7L Cummins engine and I want to make sure I use the right motor oil and I've always used Shell Rotella. I looked in the owner's manual and searched for the correct motor oil that meets the proper specifications. Shell Rotella 10w-30 T6 lists every spec except...