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 spec.

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...

Feb 13, 2010 · 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 …

Jan 27, 2025 · 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 …

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 …

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 …

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 …

Nov 8, 2018 · It wasn't till the 2019 Cummins (new CGI block) you started hearing about engine failures. What “engine failures” are you hearing/posting about? I have had my ‘24 Ram 2500 w/6.7 CTD six …

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 …

Jun 29, 2025 · I have a Cummings ISC turbocharged, aftercooled, 8.3L electronic diesel engine, in my 2001 38rp Allegro bus rv. The label for the ecm reads P/N S944125 S/N 1002497 b/c 09/19/00 ESN …