Japanese Car Auction Grades Explained — How to Read an Auction Sheet

Japan's domestic used-vehicle auction network — USS (Used Car System), TAA (Toyota Auto Auction), JU, CAA, AUCNET and others — runs a broadly shared condition-grading system, with inspector criteria attributed to the Japan Auto Appraisal Institute (JAAI). Before a car is auctioned, an inspector employed by the auction house assigns it a grade and fills in a condition report, usually called the auction sheet (出品票, shuppinhyō). The sheet lists an overall grade, a separate interior grade, a top-view diagram of body defects, the odometer reading, and the inspector's written notes. It travels with the car and is the document export buyers rely on.

A grade is a useful starting point, not a guarantee. It is one inspector's cosmetic-and-condition snapshot taken on a single day, without a road test and without putting the car on a lift. It is not independently audited, different auction houses apply the scale with different strictness, and — importantly for older cars — mechanical condition and underbody corrosion sit largely outside what the grade measures. Read the grade as a filter for which cars to look at more closely, not as a verdict.

The overall grade is a single mark covering the car's visible exterior condition (the interior is graded separately, and repair history is flagged separately — both are covered below). The scale, and how realistic each grade is on a 15–25+ year-old import-age car, is summarised here. The mileage figures are typical thresholds, not hard rules.

The cars most overseas buyers import are old enough to clear a destination's age rule — 15 years for Canada, 25 for the US and the simplest Australian pathway (see the 25-year rule). The grade scale, however, was built around the whole Japanese market, where most cars are far newer. Applied to an old car, the top of the scale effectively disappears.

The reason is partly arithmetic. Japanese cars cover roughly 8,000–10,000 km a year on average, so a 25-year-old car that was driven normally sits somewhere around 200,000–250,000 km — already past the mileage band associated with Grade 4 and well past Grade 5. Even a treasured low-mileage example carries 25 years of paint oxidation, faded trim, perished rubber and small parking knocks that an inspector records. As a practical pattern reported consistently by exporters: Grade 5 is essentially absent on cars older than about ten years, Grade 4.5 is extremely rare past fifteen, Grade 4 is achievable but not the norm, and Grade 3.5 is where most sound, honest older cars land. Interior Grade C is common and expected on a car this age.

So the grade should be read relative to age. A 3.5 on a two-year-old car signals a neglected car; a 3.5 on a 25-year-old enthusiast car is consistent with normal wear across a quarter-century and is often a perfectly good buy. On an older car, the inspector's written notes and the damage diagram matter more than the headline number — they tell you whether a 3.5 is honest age or a specific problem.

A common misconception is that the numeric grade tells you whether a car has been in an accident. It does not. Structural repair history is recorded separately, as its own yes/no field: 修復歴 (shūfukureki, "repair history"), marked あり (yes) or なし (no).

That field is triggered only when one of the car's core structural members has been repaired or replaced — frame rails, pillars, the floor pan, the firewall/dash panel, cross members, the strut/inner panels, or a welded core support. Bolt-on panels — doors, fenders, hood, trunk lid, bumpers — do not count toward repair history even if they have been replaced or repainted. So a Grade 3 car can have no repair history at all, and a tidy Grade 4 or 4.5 car can still carry a repair-history mark if structural work was done cleanly. The number and the repair-history flag are two independent things; check both.

Grading is done quickly, by a person, to a judgement call — so it is not perfectly consistent. Cars are sometimes graded higher than they deserve and sometimes lower, and the same physical car can come back with different grades at different venues. TAA and CAA, for instance, have a reputation for stricter grading than USS, to the point that a 3.5 at a strict house can be the equal of a 4 elsewhere; treat the auction-house name as part of the grade.

Two things make this worse on older cars. First, cars are sometimes cleaned and lightly touched up before sale specifically to present well to the inspector, which lifts the apparent grade without changing what is underneath. Second — and this is the larger issue for a 25-year-old car — the inspector does not drive the car and does not get under it. Engine and drivetrain condition, suspension wear, prior amateur repairs, and rust on the chassis and floor underneath the panels are largely outside the visual grade. Surface rust in particular is widely noted as under-represented in the headline number. A grade with a star (for example 3* or 4.5*) is a specific warning that the car has a known mechanical fault and the grade reflects body condition only. None of this makes the grade useless — it makes it a filter, not a final answer.

The interior is graded separately from the body, on a letter scale that runs A (like new, no significant wear), B (light wear, minor marks), C (visible staining, burns, or wear that needs cleaning), D (poor — tears, heavy staining, odours), and at some auction houses E (very poor, needs extensive restoration). Because it is independent of the overall grade, a car can be a Grade 4 outside and a Grade C inside — worth knowing if you intend to use the car rather than restore it. The sheet typically also notes whether items such as the navigation unit, spare tyre, floor mats, and original audio are present.

The sheet carries a top-view map of the car with letter codes marking the type and location of each body defect, usually with a severity number (1 = minor/barely visible, 2 = moderate, 3 = significant; some auction houses extend certain codes to 4). The core codes are consistent across the major houses:

• A — scratch (a surface scratch; e.g. A1 light, A3 deep enough to need repaint).
• U — dent without paint damage (U1 thumb-sized through U3 larger, panel deformed).
• B — a dent combined with a scratch or paint damage.
• W — a repaired or repainted panel (wavy/filler-repaired surface). W1 is a near-invisible repair; W3 is a poor one. This is the mark for ordinary repaint work — it is not structural repair history.
• S — rust. C — corrosion (deeper, sometimes through the panel). E — hail-type dimples (many small shallow dents).
• P — paint damage (chips, blistering, peeling). H — paint fade / colour oxidation. Y — a crack or hole. G — a stone chip on the glass.
• X — a panel that needs replacing. XX — a panel that has already been replaced.

The sheet records the odometer reading on inspection day. Japan's mileage-history system (administered by MLIT, with export checks available through JEVIC and equivalents) lets inspectors flag a suspected rollback, but the reading is still only the figure on the day, and on very old cars the history can be incomplete or simply marked unconfirmed. Cross-check mileage against the wear you can see — pedals, seat bolster, steering wheel — and, for anything valuable, request an independent export inspection that checks the odometer against MLIT records. The dedicated guide on verifying a car's real mileage covers this in detail.

The broader point is that the grade, the interior letter and the repair-history flag together describe how a car looks and whether its structure has been repaired — not how it runs or how it has rusted underneath. A JEVIC or equivalent pre-export inspection adds odometer verification and a basic function check; some agents will also take underside photos and do a short drive before you bid. None of these fully replaces the safest check on an older car: an in-person inspection by someone with mechanical and bodywork expertise who can put the car on a lift, drive it, and judge what an auction sheet cannot capture. If buying a verified import dealer's already-landed car, that inspection can happen before you commit. Use the grade to shortlist; use eyes and expertise on the car to decide.