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...

Mar 23, 2016 · In this case, I have the 6.7 Cummins engine, 340hp, Allison 2500 transmission. My 40' RV weighs in at 29500, and I towed a Jeep Wrangler for 7 years, now nearly 4 years towing a Jeep …

Dec 1, 2020 · Just bought a 2024 2500 with the 6.7l Cummins. It’s my first diesel. It has 4000 miles on it, question is what are your thoughts on what oil to use, Manual says 10w-30 rotella above 0* ambient …

May 24, 2021 · Cummins Great Plains replaced it after several days of diagnosing the problem. Then had to wait 5 days for a rebuilt one to arrive. Normally they had replacement parts next day, but the …

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 …

Apr 28, 2021 · So if cummins make a 270hp version all the way up to a 450 version you can tune the motor any where in between, or more! But the service life of a 450 marine ISC and a 350 isc are 2 …

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 …

May 11, 2022 · Fleetguard is Cummins filter brand. Cummins also recommends Valvoline Super Blue full synthetic oil but you can't go wrong with any of the big name diesel oils: Mobil Delvac, Rotella T6, …

Feb 23, 2026 · Members are troubleshooting a significant exhaust leak on a 2008 Holiday Rambler with a 5.9 Cummins engine, which is unusual for that model year. The original poster is seeking …