AutoMotor.ai
Used & Reman Detroit Diesel Engines
Detroit's DD-series dominates Freightliner linehaul. Integrated powertrain support and wide reman coverage make DD15/DD13 units a practical repower.
Hi 👋 I'm AutoMotor AI.
Sourcing a Detroit Diesel engine? Tell me a bit about your application and I'll match it.
What part do you need?
What truck is it for?
Detroit Diesel models we source
What to know before you buy
Compatibility
Heavy-duty fitment turns on more than year/make/model. Engine family, ECM calibration, emissions configuration (pre-EGR, EGR, DPF/SCR), and drivetrain ratios all matter. Our AI cross-checks the details you provide, and a specialist verifies fitment against the actual unit before anything ships.
Used vs. Rebuilt / Reman
Used (running take-out) units are the fastest and lowest-cost path when a low-hour core is available. Rebuilt/reman units cost more but ship with fresh internals and a longer warranty. For over-the-road trucks that need to stay earning, we'll lay out both so you can weigh downtime against total cost.
Warranty
Warranty terms vary by supplier and unit condition — used, rebuilt, and reman each carry different coverage. Options and exact terms are confirmed in your written quote before purchase; nothing is assumed.
Freight & Delivery
Heavy assemblies ship LTL freight on a pallet, typically 2–7 business days depending on lane and residential vs. commercial delivery. Liftgate and terminal pickup options are quoted per destination.
Frequently asked questions
Can I put a used truck engine in without matching the exact CPL/serial?
Often not. Emissions configuration, ECM calibration and rating have to line up. Give us the VIN or the engine serial and a specialist confirms the correct unit before you commit.
Used take-out vs. reman — which should I buy?
A low-hour used take-out is fastest and cheapest when one is available. Reman costs more but resets internals and warranty. We'll price both against your downtime.
How is a heavy engine shipped?
On a pallet via LTL freight, usually 2–7 business days. Liftgate and terminal pickup are quoted per destination.
Do you sell the whole engine or a long block?
Both are sourced depending on what your repair needs — complete running engines, long blocks, and short blocks. Tell the AI what failed and we'll target the right assembly.