Research · Midsize Cars
1997 Mitsubishi DiamanteRecalls, problems, MPG & safety
NHTSA lists 0 safety recalls and 34 owner complaints for the 1997 Mitsubishi Diamante. Most complaints involve service brakes, hydraulic (13) and power train (10). The EPA rates it 19 mpg combined.
Combined MPG
19mpg
EPA · 1 version
NHTSA overall
—
Not rated by NCAP
Safety recalls
0campaigns
NHTSA
Owner complaints
34
Top: service brakes, hydraulic
Fuel cost / yr
$4,200est.
EPA estimate, best version
Safety recalls
NHTSA campaigns for this model year
0 recalls found in NHTSA data for the 1997 Mitsubishi Diamante as of Oct 30, 2026.
Data from NHTSA Recalls API · synced Oct 30, 2026NHTSA vehicle page
Owner complaints by component
34 complaints filed with NHTSA · Aug 1997 – Jul 2008
- Service brakes, hydraulic13
- Power train10
- Engine and engine cooling4
- Visibility3
- Fuel system, gasoline3
- Tires2
- Seat belts2
- Electrical system2
- Parking brake2
Complaints are unverified owner reports to NHTSA and are not normalized for sales volume. One complaint can cite several components.
Data from NHTSA Complaints API · synced Oct 30, 2026 · Full problem breakdownNHTSA vehicle page
What owners report most
Verbatim excerpts from NHTSA complaints, by component
Service brakes, hydraulic
13 reports1 crash
“I PURCHASED THIS VEHICLE 2 MONTHS AGO AND HAVE MADE 5 TRIPS BACK TO THE DEALER DUE TO BRAKES, TIRES & ENGINE TAPPING AND NOW THE TRANSMISSION SEEMS TO BE SLIPPING. *AK (DOT NUMBER: N/A TIRESIZE: P21560R16)”
Power train
10 reports1 crash
“SAFETY - TRANSMISSION: AT 9,500 MILES MY CAR STARTED LURCHING WHEN STEPPING ON THE GAS FROM A STOP. IT SUPPOSEDLY WAS REPAIRED BUT HAS CONTINUED TO BE PROBLEM AND EACH TIME I BRING IT IN FOR SERVICE THE DEALER CAN NOT RECREATE THE PROBLEM. SINCE I HAD NOT HEARD THAT THIS HAS BEEN ON GOING PROBLEM WITH THIS MODEL, I THOUGHT IT MUST BE SOMETHING THAT I HAD DONE. UPON REVIEWING THE INFORMATION OF NHSTA, I REALIZE THAT THE DEALERS AND MITSUBISHI ARE DELIBERATELY HIDING THIS PROBLEM. SAFETY - FUEL TANK: MY FUEL TANK BEGAN LEAKING AT 59,560 MILES AND WHEN THE DEALER REMOVED IT HAD 3 STRESS WHOLES. THE TANK HAD TO BE SENT OUT FOR WELDING. OF COURSE, I HAD TO PAY FOR THE REPAIR EVEN THOUGH I SPOKE DIRECTLY TO THE MITSUBISHI COMPLAINT DEPARTMENT. SINCE IT WAS NOT A RECALL ITEM, MITSUBISHI OR THE DEALER WILL NOT PAY FOR THE REPAIR. THE DANGEROUS FUEL LEAK IS ANOTHER ONGOING HIDDEN PROBLEM. ALTERNATOR PULLEY: HAS BEEN MAKING NOISE FROM THE BEGINNING AND I HAVE COMPLAINED EACH SERVICE. NOW, I DISCOVER THROUGH NHTSA THAT ALTERNATOR PULLEY IS A KNOWN DESIGN FLAW. MITSUBISHI AND THEIR DEALERS MUST BE HELD ACCOUNTABLE.*AK”
Engine and engine cooling
4 reports
“THERE IS A MAJOR PROBLEM WITH THE MITSUBISHI DIAMANTE HEATER CORE GOING OUT. MINE WENT OUT A FEW DAYS AGO AND WAS INFORMED BY MITSUBISHI IT WILL COST ME 965 TO REPLACE. EVEN THOUGH THERE ARE HUNDREDS OF MITSUBISHI DIAMANTE OWNERS COMPLAINING ABOUT THIS PROBLEM INCLUDING WITH PEOPLE THAT HAVE AS LOW AS 30-45K ON THEIR VEHICLE. PLEASE LOOK AT THIS FORUM WHICH SHOW MANY MITSUBISHI OWNERS COMPLAINING ABOUT THEIR VEHICLE.. HTTP://WWW.DIAMANTEOWNERS.COM/FORUM/LOFIVERSION/INDEX.PHP?T3615-0.HTML PLEASE HELP ME AND HELP THESE POOR OWNERS. RECALL THIS MAJOR ERROR MISTUBISHI KNOWS ABOUT BUT REFUSES TO DO ANYTHING ABOUT IT AND KEEP SILENT. THIS ALSO CAN CAUSE DEATH BECAUSE WHEN THE HEATER CORE FAILS IT LEAKS AND CAUSES A BAD ODOR OF ANTIFREEZE. YOU WOULDN'T WANT YOUR KIDS BREATHING ON THAT WOULD YOU. ON THE WEBSITE I HAVE PROVIDED YOU IT WILL SHOW A CASE IN WHICH A PERSON WENT INTO RESPIRATORY FAILURE DO TO INHALING ANTI FREEZE.. MANY OF THESE OWNERS TILL THIS DAY FACE A DANGER BECAUSE THEY HAVE NO CHOICE BUT TO DRIVE THESE VEHICLES AS IT IS THERE ONLY MEANS OF TRANSPORTATION AND MANY CANNOT AFFORD TO FIX THIS EXPENSIVE PROBLEM (COSTING AS MUCH AS 1,300). WE BEG OF ALL THE…”
Data from NHTSA Complaints API (owner reports, unverified) · synced Oct 30, 2026
Engines, transmissions & drive
1 version rated by the EPA
- EPA class
- Midsize Cars
- Engines
- 3.5L 6-cyl
- Transmissions
- Automatic 4-spd
- Drive
- Front-Wheel Drive
- Fuel
- Premium Gasoline
Towing, payload and dimensions aren’t in the EPA or NHTSA data, so we don’t list them.
Data from EPA fueleconomy.gov · synced Oct 30, 2026EPA listing
EPA fuel economy by version
City / highway / combined, annual fuel cost and CO₂
EPA
| Version | City | Hwy | Comb. | Fuel / yr | CO₂ g/mi |
|---|---|---|---|---|---|
| Diamante Auto 4-spd, 6 cyl, 3.5 L · Front-Wheel Drive | 16 | 24 | 19 | $4,200 | 468 |
- 19mpg comb.
Data from EPA fueleconomy.gov · synced Oct 30, 2026 · Fuel cost is EPA’s annual estimate (15,000 mi, 55% city)
NHTSA 5-Star Safety Ratings
New Car Assessment Program
NHTSA has not published 5-Star Safety Ratings for the 1997 Mitsubishi Diamante as of Oct 30, 2026.
Data from NHTSA NCAP Safety Ratings API · synced Oct 30, 2026
Maintenance basics
General guidance, not the OEM schedule. Check your owner’s manual.
General guidance
| Item | Miles | Time | Note |
|---|---|---|---|
| Engine oil & filter | 5,000–10,000 mi | 6–12 months | Follow the oil-life monitor if fitted |
| Tire rotation | 5,000–7,500 mi | Every oil change | Check pressure monthly |
| Engine air filter | 15,000–30,000 mi | 1–2 years | Sooner in dusty areas |
| Cabin air filter | 15,000–25,000 mi | 1–2 years | |
| Brake fluid | — | 2–3 years | Absorbs moisture over time |
| Coolant | 60,000–100,000 mi | 5–10 years | Long-life coolants last longer |
| Spark plugs | 60,000–100,000 mi | — | Iridium/platinum plugs at the long end |
| 12V battery | — | 3–5 years | Heat shortens battery life |
- Engine oil & filter5,000–10,000 mi
6–12 months - Tire rotation5,000–7,500 mi
Every oil change - Engine air filter15,000–30,000 mi
1–2 years - Cabin air filter15,000–25,000 mi
1–2 years - Brake fluid—
2–3 years - Coolant60,000–100,000 mi
5–10 years - Spark plugs60,000–100,000 mi
— - 12V battery—
3–5 years
Typical intervals for modern cars. Severe service (towing, short trips, extreme heat or cold) shortens them.
1997 Diamante questions
How many recalls does the 1997 Mitsubishi Diamante have?
0 recalls found in NHTSA data as of Oct 30, 2026.
What are the most common 1997 Mitsubishi Diamante problems?
Owners filed 34 complaints with NHTSA. The most-cited components are service brakes, hydraulic (13), power train (10), engine and engine cooling (4). Complaints are unverified owner reports and aren't adjusted for how many cars were sold.
What MPG does the 1997 Mitsubishi Diamante get?
The EPA rates the 1997 Mitsubishi Diamante at 19 mpg combined, depending on engine and drivetrain (1 version rated).
Data from NHTSA & EPA · synced Oct 30, 2026