Cummins 6.7L
The inline-six workhorse in Ram heavy duties. Guides below.
Cummins Generations Explained: 12 Valve to 6.7L, and Which One to Buy
From the 1989 12 valve to the modern 6.7L, every Cummins generation has a personality, a weak spot, and a price. A Red Seal mechanic breaks down which ones to hunt for and which to walk away from in Canada.
Aisin vs 68RFE: Which Ram Transmission Should You Want
A Red Seal diesel mechanic compares the Aisin AS69RC and Chrysler 68RFE transmissions in Ram Cummins trucks: strength, reliability, service costs, and which one fits your towing life.
6.7 Cummins EGR Delete Kits: What Mechanics Actually Say
Thinking about an EGR delete kit for your 6.7 Cummins? A Red Seal diesel mechanic explains why owners want one, what the law says, and what to do instead when the EGR cooler fails.
DPF Replacement Cost in the USA: What Dealers Charge
DPF replacement on a US diesel pickup runs $2,500 to $5,500 installed at a dealer. See part prices by engine, cleaning costs, and what to check before you pay.
Cummins Water Pump Cost: USA Shop and DIY Prices
Cummins water pump cost: real USA prices for 5.9 and 6.7 pumps, shop labour rates from $100 to $190 an hour, and the driveway DIY total. All prices in USD.
Cummins Injector Replacement Cost in Canada: 2026 Prices
Cummins injector replacement in Canada runs $2,690 to $4,330 CAD for six reman injectors plus core and labour. 2026 prices for the 5.9 and 6.7, reman vs new.
Cummins Fuel Filter Price Canada: 6.7L Cost Guide
Cummins fuel filter price in Canada: about 146 CAD for OEM Mopar 68157291AA, 119 CAD for Fleetguard FS53000. Real 2026 prices, both filters, and shop cost.
CP4 vs CP3: Which Pump Your Truck Has and Why It Matters
CP4 vs CP3: find out which fuel pump your Duramax, Powerstroke, or Cummins has, test it with a scan tool, and weigh conversion cost against a failure repair.
Best Oil for 6.7 Cummins: What to Use and Avoid
Best oil for 6.7 Cummins? Your model year matters more than the brand. CES 20086 specs, the 2019 15W40 ban, winter grades and Canadian prices from a DIY owner.
68RFE Transmission Problems: What Fails and What It Costs
68RFE transmission problems cost Ram owners real money. Here is what fails, what a rebuild costs in USD and CAD, and the maintenance that keeps one alive.
6.7 Cummins vs 6.7 Powerstroke for Towing — Which Pulls Better
I work on both every week. Here is how the Cummins and the Powerstroke compare when there is real weight behind the truck, not just brochure numbers.
How to Clean a DPF Filter (Regeneration Guide for Diesel Trucks)
Your truck is asking for a DPF regen and you are not sure what to do. Here is what actually works, from a mechanic who has done hundreds of them.
6.7 Cummins Reliability — What Breaks and What Does Not
Fourteen years working on 6.7 Cummins engines. Here is my honest take on what actually goes wrong and why this engine earned its reputation.