Japanese auction grades for 25-year-rule imports
The grading system was built to trade used cars three to eight years old inside Japan. You are buying one that is thirty. Most of what you will read about grades quietly assumes the first case.
There is no shortage of guides explaining Japanese auction grades. Exporters publish them, importers publish them, and they broadly agree with each other. They are also all written for the same reader: someone buying a recent Japanese used car.
That reader is not you. A car eligible for import to Australia under the 25-year rule was built in 2001 or earlier. Some of what the grading system measures still applies perfectly. Some of it stopped meaning anything two decades ago. Knowing which is which is the difference between reading a sheet and understanding one.
Start with what the grade is actually for
A Japanese auction grade is assigned by an inspector employed by the auction house, not by the seller. That independence is the source of its value, and it is genuinely unusual — most used car markets in the world have nothing equivalent.
But the inspector is grading a car for the Japanese domestic trade. The system exists so that a dealer in Osaka can bid on a car in Sendai without seeing it. The categories were drawn around the cars that actually move through that market in volume: vehicles coming off their second or third shaken cycle, typically well under ten years old.
Published grade descriptions carry mileage ceilings that give this away. Grade 5 commonly comes with a figure around 50,000 km, grade 4.5 around 100,000 km, grade 4 around 150,000 km. Those numbers are meaningful on a car from 2018.
On a 1995 car, the mileage ceiling tells you almost nothing. 98,000 km over thirty years is roughly 3,200 km a year — a car that mostly sat. Whether that is good news or bad news depends entirely on how it sat, and the grade has no way to express that. Long storage is hard on seals, fluids, rubber and fuel systems in ways that hard use is not.
The grade scale, read for an old car
Interior grade
A separate letter, usually A through E, sits alongside the number. A is close to unused. B is light wear. C is visible wear, possibly small tears or burns. D and E mean restoration territory.
On a thirty-year-old car, interior C is normal and interior A should make you ask questions. Japanese nineties interiors have known failure modes — dashboard cracking, headliner sag, sticky soft-touch plastics — and a grade of A on an unrestored car is unusual enough to warrant a photo request.
Grade 1 is the one people misread
Every guide lists grade 1 and moves on. For a JDM buyer it deserves its own section, because the category quietly bundles together things that have nothing to do with each other.
A grade 1 can mean flood damage. It can also mean the car has a different engine, a roll cage, or aftermarket suspension. A track-prepared Silvia in excellent mechanical order and a waterlogged wreck can land in the same bucket.
This matters more in Australia than almost anywhere else, because the modifications that drove the low grade in Japan are the same modifications that complicate your registration here. A non-standard engine and structural changes are explicit triggers for a roadworthy inspection in South Australia. The auction sheet is warning you about your registration pathway, months before you get there.
We wrote about how that plays out in practice in registering a JDM import in South Australia.
R and RA: what repair history actually means
Australian buyers routinely treat an R grade as disqualifying, on the reasonable assumption that it means “accident car”. The Japanese definition is narrower and more specific than that assumption.
Repair history in the Japanese sense refers to repair or replacement of the vehicle’s core structural sections — the frame members, pillars and floor structure. Replacing a bolt-on panel does not create repair history. A car can have had a new bonnet, both front guards, a door and a bumper and still carry no repair history at all.
Finding a thirty-year-old performance car with no structural repair anywhere is not a realistic filter. These cars were driven. Ruling out every R and RA removes a large share of the honest market and pushes you towards cars where the history is simply less documented.
The useful question is not whether there is repair history, but where and how well. RA indicates lighter work with a better finish. What you want is the location on the body diagram and, ideally, photographs of that area. That is a question for the seller, and a seller who cannot answer it is telling you something.
The damage codes
The body diagram carries letter and number pairs. The letter is the type of flaw, the number is severity, and the position on the diagram is where it sits.
- A
- Scratch. A1 is small and touch-up level, rising through A3 and beyond to damage across a substantial part of a panel.
- U
- Dent. U1 is small and hard to see, higher numbers indicate size and depth.
- B
- Dent with an accompanying scratch.
- W
- Repaired area. W1 means the repair is not readily visible, higher numbers mean it is.
- S
- Rust.
- C
- Corrosion — further along than surface rust.
- P
- Paint defect, such as pinholes or blistering.
- X · XX
- Requires replacement, and has been replaced, respectively.
- Y
- Tear or hole.
- G
- Glass damage, typically a stone chip.
S and C deserve more attention than they get
For an Australian buyer these two matter more than any scratch. Rust and corrosion in a structural location are what fail a roadworthy inspection, and rectification is expensive.
Two things compound the risk. Cars from snow-country prefectures have spent winters on salted roads, and the underbody is not represented on the sheet with anything like the detail given to the visible panels. A clean diagram is not a clean underbody.
If the sheet shows S or C anywhere, ask for underbody photographs before you bid. Not after.
Why three guides give you three different answers
Read several English explanations of the damage codes and you will find they disagree. One says the scratch scale runs A1 to A3. Another describes A1 to A5. Severity thresholds are given in centimetres by some sources and not at all by others.
None of them is lying. Japan has many auction houses — USS, TAA, JU and others — and their sheet formats and grading criteria differ. A guide written from USS sheets describes something slightly different from one written from a regional venue.
The practical consequence is that any guide stating a precise threshold without naming the auction house is over-claiming. Including this one, which is why the descriptions above are deliberately relative rather than measured in centimetres.
When you are looking at a real sheet, the venue is on it. Ask which auction house it came from, and read the codes as that venue’s inspector meant them.
What the sheet cannot tell you
This is the section most guides skip, and on a thirty-year-old turbocharged car it is the section that decides whether you enjoy the purchase.
Nobody drove the car. Auction inspection is a static assessment — the vehicle is examined in a lane, not tested on a road. There is no compression test, no leak-down figure, no gearbox report and no assessment of thirty-year-old wiring, ignition components, or rubber.
A grade 4 car can be weeks away from an engine rebuild and still be graded correctly. The inspector recorded what was in front of them, accurately. It simply was not the thing that will cost you the most money.
Treat the grade as a reliable account of the body and interior, and get the mechanical picture from somewhere else — service records, a pre-purchase inspection, or direct questions to a seller who has actually seen the car.
Reading a sheet in practice
- Check the venue first. It frames how you read everything else.
- Look at the damage diagram before the grade. The grade is a summary; the diagram is the evidence.
- Search for S and C specifically. Then ask for underbody photographs.
- Treat R and RA as a question, not a verdict. Where, and how well?
- If the grade is 1 or 0, find out why. Modified and flooded are not the same purchase.
- Ignore the mileage ceiling implied by the grade. Ask instead how the car spent the last thirty years.
- Assume nothing about the mechanicals. The sheet is silent on them by design.
Translation tools have made the first layer of this easy. Phone camera translation will get you the words. What it will not do is tell you that the mileage band the grade implies stopped being informative twenty years ago, or that the modification which cost the car two grade points in Japan is going to meet you again at a South Australian inspection station.
Grading criteria differ between auction houses and change over time. This guide describes general conventions and is not a substitute for reading the specific sheet for the specific car, from the venue that issued it.
Join the waitlist