Cummins 6.7 ISB Oil Capacity Confusion: 12, 15, or 17 Quarts?
Feb 20, 2026 · 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 …
Best and worst Cummins ISL 400 engine years - iRV2
Sep 5, 2022 · I’m looking to buy an ISL 8.8 or 8.9 engine with the common rail fuel system and without the DEF system. What are the best and worst years to buy? Also, any...
Cummins ISL9 engines....Good, Bad or Ugly? - iRV2
Jun 22, 2025 · 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 …
Best Practices for Testing and Replacing OAT Coolant in Cummins
Feb 16, 2026 · 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 …
When Should You Adjust Valves on a 5.9 Cummins With High Mileage …
Feb 14, 2026 · Members with extensive experience on the 5.9 Cummins engine generally agree that valve adjustments are rarely needed before 100,000 miles, especially if the engine is running …
2025 Cummins Diesel does not wait to start in cold
Jan 27, 2026 · The Cummins® Turbo Diesel engine is equipped with several features designed to assist cold weather starting and operation: The engine block heater is a resistance heater installed in the …
Cummins Oil | RamForum.com | Dodge Ram Forum for Truck Owners …
Jun 23, 2025 · 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 …
Cummins ISB 6.7 300hp | iRV2 Forums
Nov 4, 2025 · Members are seeking ways to increase the power of a Cummins ISB 6.7 (300hp) engine for better hill performance while towing a stacker trailer, with a focus on remaining legal in California. …
Cummins ISL 400 Engine Failure - iRV2
Jul 8, 2017 · Not to bring up an old problem with Cummins ISL 400 engines, but I didn't know it was an old problem until we recently (June 2017) experienced catastrophic engine failure and started …
Cummins ISL9 oil pressure question | iRV2 Forums
Dec 4, 2025 · Members discussed oil pressure readings on the Cummins ISL9 engine using the Bluefire ECM reader. The original poster noticed a 68 psi oil pressure at cold startup and questioned if this …