This service bulletin provides information for maintenance cleaning of the fuel injectors and gasoline detergent additive.
full bulletin at NHTSA ↗2008 Cadillac DTS engine problems
severe 10 complaints filed with NHTSA · avg repair $3,100 · see engine across all vehicles →
Failure mileage
Complaints
10
Recalls
0
Avg fix
$3,100
1fire
When does it fail?
Of the 10 engine complaints filed for the 2008 Cadillac DTS, here's the actual mileage breakdown — failures cluster heaviest at 75,000-100,000 mi.
0-25k
25-50k
50-75k
75-100k
100-125k
125-150k
150k+
Each bar shows the share of total complaints filed at that mileage range. Peak failure window highlighted. Some owners report problems earlier; some make it well past 150,000 miles symptom-free. Maintenance habits and driving conditions shift the curve as much as mileage alone.
What stands out
Among the 6 model years of Cadillac DTS in our records for engine problems, this one ranks #3 by owner-complaint volume.
No new NHTSA engine complaint has been filed on this vehicle in over 6 years — the issue may be aging out of the active population.
Is there a fix? Manufacturer service bulletins
The manufacturer has issued service bulletins covering engine on this vehicle — documented repair instructions, service campaigns, or warranty extensions sent to dealers. A TSB isn't a recall (it's not a free safety remedy), but it's the manufacturer acknowledging the issue and how to fix it.
This bulletin provides information on identifying Non-GM Engine Calibrations for Gasoline Engines using the Tech 2 or GDS 2.
full bulletin at NHTSA ↗This service bulletin provides guidelines and diagnostic/repair information to technicians regarding vehicle engine oil consumption.
full bulletin at NHTSA ↗This service bulletin advises of a new fuel injection cleaner kit used for decarbonizing the intake valves to correct conditions of rough idle, Crank no start, extended crank or misfire, MIL with DTCs, and explains how Top Tier fuels should be used to reduce carbon build-up.
full bulletin at NHTSA ↗This service bulletin provides technicians with information to help identify the differences between what is considered a fluid leak, and what is considered fluid seepage.
full bulletin at NHTSA ↗Source: NHTSA manufacturer communications. Bring the bulletin number to your dealer or shop.
The failure pattern owners describe
Owners report persistent oil leaks from the pan, filter housing, valve covers, crankcase, and manifold seals beginning in the 85,000–115,000-mile range, though one owner experienced fume problems as early as 64,000 miles. Leak rates reach approximately 1 quart per 1,500 miles. Oil drips onto driveways and garage floors; when it contacts the exhaust or hot engine surfaces, it creates white smoke and burned-smell fumes that sometimes pour into the cabin via the heater vents, forcing occupants out of the vehicle.
Dealership repairs—oil pan replacement, filter housing replacement, valve cover replacement—frequently fail to resolve the leaks. One owner had repairs recur after replacing the pan, housing, and covers; another was told by a dealer that manifold-seal repair requires complete motor removal and resealing. A former GM troubleshooter corroborated that this is a widespread defect in 2006–2010 Cadillacs, often timing out under warranty.
Owners face repair costs of $1,000–$2,000 for partial fixes or $4,500 for full engine replacement. GM has not issued a recall. The manufacturer offered token credits ($100–$1,000) but made no structural repairs. Dealership technicians repeatedly fail to diagnose and fix the problem, and diagnostic codes (P0411) that do appear are simply reset.
Same Cadillac DTS engine reports on nearby years: 2006 · 2007
Failure modes owners describe
Oil leaks from pan, seals, and gaskets
Oil leaking from the oil pan, oil filter housing, valve covers, crankcase, and engine manifold seals. Leaks occur at a rate of approximately 1 quart per 1,500 miles on some vehicles. Oil drips onto the driveway and garage floor.
When: 85,000 to 115,000 miles; one complaint reported at 64,000 miles for fume issues; reported across vehicle lifespans from purchase at 69k miles (Feb 2017) to 99,000 miles
Symptoms owners cite: Oil spots on garage floor or driveway; Oil leaking from oil pan and filter housing; Oil leaking from crankcase; Oil leaking from engine manifold; Oil and transmission fluid pooling under the engine; Smoke from under the hood or engine compartment when oil contacts hot surfaces; White smoke from underneath engine on passenger side; Burning oil smell from heater vents
Codes mentioned: P0411
Repairs/costs cited: Oil pan replacement; oil filter housing replacement; valve cover replacement; crankcase seal repair. One owner reported repair costs of $1,000–$2,000 to address design flaw; another cited $4,500 for full engine replacement due to severity. Repairs often recur. One dealer stated motor replacement would be required for manifold leak repair.
Recalls/TSBs owners mention: GM offered $100 voucher toward repair on one vehicle (95,000 miles). Another owner reported $1,000 credit toward new Cadillac purchase. GM acknowledged complaints but did not issue recall; dealerships reset computer when check engine light appeared. A former GM troubleshooter noted the problem is common on 2006–2010 Cadillacs and requires motor removal and resealing.
Fuel vapors in cabin air vents
Strong fumes, identified as oil-smell fumes, coming from the heater vents into the cabin. Fumes described as so severe occupants had to exit the vehicle. Multiple owners reported complaint to dealerships without resolution.
When: 64,000 miles on one vehicle (complaint ongoing for over a year before reporting); reported in March and May 2014
Symptoms owners cite: Oil or fuel-like fumes from heater vents; Fumes strong enough to force occupants to leave vehicle; Check engine light illuminated with code P0411 (secondary air injection system issue)
Codes mentioned: P0411
Repairs/costs cited: Two different Cadillac dealerships unable to identify or fix the problem. Computer reset at dealer when check engine light appeared.
Recalls/TSBs owners mention: GM received written complaints, including certified mail to CEO Mary Barra. GM customer service stated they were 'very concerned' but took no corrective action. Owners reported that once they mentioned filing congressional complaints, GM communication stopped. One former GM troubleshooter indicated the problem is common on 2006–2010 Cadillacs and suggests motor removal and resealing is necessary.
Synthesized from 10 NHTSA owner complaints — unverified consumer allegations, summarized for patterns. The verbatim filings appear below.
What owners are reporting 2 most recent
Tl* the contact owns a 2008 Cadillac dts. The contact noticed oil spots on the garage floor. The contact took the vehicle to guys Buick GMC truck (1316 n mildred st, ranson, wv 25438) where it was determined that oil was leaking from the crank case in the engine. The contact was referred to a Cadillac dealer for the repair. The vehicle was not repaired. The manufacturer was notified of the…
Tl* the contact owns a 2008 Cadillac dts. The contact stated that there was oil and transmission fluid leaking from the bottom of the engine while the vehicle was parked in the driveway. Also, upon coming to a stop, there was white smoke coming from underneath the engine on the passenger's side. There was no warning light illuminated. Neither the dealer nor the manufacturer were notified of the…
Had engine trouble with your 2008 Cadillac DTS?
File a complaint with NHTSA → It's free, official, and how every report above got here — owner filings are the federal safety record this page is built on.
Common questions
How serious is the engine problem on the 2008 Cadillac DTS?
It's a meaningful issue. 10 complaints have been filed and the failure mode causes operational problems for owners. Repairs average $3,100.
At what mileage does the engine typically fail?
Across the 8 complaints that reported odometer mileage, most engine failures cluster between 85,000 and 99,000 miles, with the median around 92,000. A quarter of owners report trouble before 85,000; a quarter make it past 99,000. Maintenance history matters more than the odometer alone — this is the reported failure window, not a guarantee.
What does it cost to fix?
Independent shops typically charge around $3,100 for engine repairs on this vehicle. Dealer pricing tends to run 20-40% higher. The exact figure depends on the specific failure mode, parts availability, and your local labor rates. If you're outside factory warranty, an extended service contract often covers this category.
Are there any recalls related to engine?
No active recalls currently cover engine issues on this vehicle. The complaints filed represent owner-reported failures that haven't risen to the level of a manufacturer-issued recall — but they're still worth knowing about before you buy or budget for repairs.
Related
Complaint and recall data sourced from the National Highway Traffic Safety Administration (NHTSA)
public records database. Verify the raw federal record at
nhtsa.gov/vehicle/2008/Cadillac/DTS.
Severity ratings are derived from reported crashes, fires, injuries, and fatalities. Repair cost estimates are
independent-shop national averages and may differ in your area. Some links on this page are affiliate links.