A used Mazda Cosmo is worth buying when a compression test backs up the rotary engine, the rust is limited and the title matches the car, because these are rare and expensive to rescue. Mazda built the Cosmo from 1967 to 1995 as its rotary halo car, and Wikipedia's Mazda Cosmo entry says Mazda's U.S. arm sold it only from 1976 through 1978 with the 13B rotary. When we queried the NHTSA recall API on Nov. 5, 2026 under Cosmo for those years, it returned no campaigns, so do not expect a recall printout to tell you much.
U.S. Cosmo or import
The 1976-1978 U.S. car is a personal-luxury coupe with a 13B, sold new here, so it should have a normal U.S. title history going back decades. The original 1967-1972 Cosmo Sport is a different, far rarer car; Wikipedia notes fewer than six Series II cars were originally imported into the U.S. The 1990-1995 Eunos Cosmo, with twin-turbo rotaries, was Japan-only and is now legal under the 25-year rule. Each one is its own shopping problem, and our RX-7 buying guide covers the rotary basics they share.
Rotary checks you cannot skip
Ask for a rotary-specific compression test that reports each face of each rotor; a regular piston-engine gauge does not read these engines well. Cold starts should be clean after a short warm-up, and heavy smoke or a flooded start points to seal or oil-metering problems. On Eunos cars, check that both turbos come in on sequence and that the cooling system holds pressure. Rebuilds cost real money, so price one in if the numbers are low.
Paperwork and history
For a U.S.-sold 1976-1978 car, run the VIN through an approved NMVTIS provider and compare odometer readings with any history report. For an Eunos Cosmo, ask for the customs entry, the HS-7 and EPA import forms, and the Japanese export certificate, as explained on the NHTSA importing a vehicle page. Our import title guide explains how states title these cars.
Living with one
Rotary cars want regular driving, fresh oil and patience on cold starts. Plan on a specialist for anything beyond basic service, and budget for ignition parts and seals. If the car will sit for months, ask your mechanic how to store it so the engine does not flood or lose compression.
When to walk away
- No compression numbers, or uneven numbers across rotor faces.
- Rust through floors, rockers or around the rear glass.
- An Eunos car with no import papers.
- A title that does not match the VIN on the car.
Questions to ask the seller
- Which Cosmo generation and engine is this?
- When was the engine last rebuilt, and by which shop?
- Can I see the compression test printout?
- Has the title ever been branded or reissued?
Reading the history on a decades-old car
Do not expect a long service log. Records from the 1970s and 1980s were often never reported, so the report matters most for title brands, odometer readings at title transfers and registration gaps by state. A car that moved from a coastal or rust-belt state to a dry one may have been retitled; look at the dates and ask why. An approved NMVTIS check adds salvage and junk records from insurers and recyclers. If the odometer readings go backward or the car shows as exempt, ask for the paper trail before you price it. Our odometer discrepancy guide explains what those entries mean.
Private-sale paperwork
Most cars like this sell privately. Make sure the name on the title matches the seller ID, the VIN on the title matches the plate and the stamping on the car, and any old lien is released in writing. Our lien release guide walks through that step. Pay by a traceable method, get a dated bill of sale, and do not accept an open title signed by someone who is not present.
How to price it
Prices swing widely between a U.S. 1970s coupe, an Eunos twin-turbo and an original Cosmo Sport. Compare like for like, then subtract the cost of a rotary rebuild if compression is marginal, plus a specialist inspection.
What the report costs
As of early November 2026 a CARFAX bought direct usually costs around $44.99, and AutoCheck sits a little lower. We are a licensed CARFAX and AutoCheck reseller, not affiliated with CARFAX, AutoCheck or Experian. Our guest price has been about $5.50 a report, about $4.50 for members, and about $6.75 for a CARFAX and AutoCheck bundle. Confirm the price at checkout, since it can change.
On a car this old, read the report for title brands and odometer readings first; service entries are often thin.
Sources
- NHTSA recall lookup (API checked Nov. 5, 2026)
- Mazda Cosmo, Wikipedia
- NHTSA importing a vehicle
- NMVTIS
- Mazda recall check by VIN
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