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Price opinion from advertisements and recorded sales. Not an inspection or a certified valuation.
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Reference photograph of a Mercedes-Benz SLK 55 AMG R171
Valuation · Mercedes-Benz · R171 · 2004-08

Mercedes-Benz SLK 55 AMG R171

5.4L NA V8 (M113) · 265 kW / 510 Nm · 7sp auto (7G-Tronic) · RWD
AVOIDRated within the $30k to $100k band · 92 of 94 at this money
Model value
$30,000
Must gain each year to break even
+15.1%
The projection does not clear it, and nor does most of the library.
CarQuant score
39/100
Scored against the $30k to $100k band, not the whole library
Evidence grade
Thin
One to three recorded Australian sales
$30,000
$18,885 lowhigh $35,637
Modelled estimate
No recorded Australian sale stands behind this figure. Treat the level as indicative and the structure as the analysis.

Looking at an SLK 55 AMG for sale?

Put in the asking price and the odometer reading. You will see what this model should make at that reading.

Should make, typical example
$30,000
At about 110,000 km. Enter an asking price to compare.

Odometer only. Colour, options, history, condition and the photographs move it further, and that is what the report reads.

A person reads the advertisement and its photographs. Usually back within 48 hours. Read a real listing report

Price history

Today $30,000 · modelled median at five years $28,308
Solid line: the value this library has carriedDashed from 2026: modelled · even money $23,352 to $32,163
The green band is the even-money range and the one to plan on: half of outcomes land inside it. The pale band behind it bounds eight in ten ($18,885 to $35,637). The path is this model's own: it starts along the momentum of its recorded history and bends toward its projected median as the horizon lengthens, so no two cars share a future curve.

The verdict

The numbers argue against it. Scores 39/100, ranking 92 of 94 in the $30k to $100k band. Scarcity is the strongest input, risk resilience the weakest.
Running it costs about $5,500 a year (18.3% of value), which is what the economics score measures. All in, including the projected value change, it is $6,278 a year.
The model's five year median is $28,308, a -5.6% move, with the tenth percentile at $18,885.
Value calibrated to a thin record. Treat the level as provisional.
Evidence
Thin3 recorded sales
Off its peak
-8%
Value band
wide
No external evidence. A modelled estimate whose structure is more useful than its level.
Scored against every recent Australian sale this library holds, half its values land within 11.2 per cent of the price paid and the rest miss by more, in either direction. Projections are therefore damped toward flat in proportion to how little is known, and the plausible band is never narrower than the error the model is known to make.
Short term (1-5 years)$6,278 a year all in, -5.6% median value move
Long term (10-15 years)Scarcity case already formed
Negotiate from$30,000

Recorded sales

Every recorded observation, and when
3 rows on record
$76k$50k$23k
2023202420252026
the value this record published, year by yearnow $30kwhat the model expects across 30k–114k kmsold
Every row, with its price and note (3) ↓
Library value against the sold record
3 sales · median $54,000
Value $30,000
$33,250$70,000
The library value sits below the lowest recorded sale; the evidence note above explains why.
2024Collecting Cars$33,250Sold
SOLD. 26 Jun 2024, Glenorie NSW, 114,053km. X-pipe exhaust, secondary cats removed, originals supplied. Eleven dated service entries
2023Collecting Cars$54,000Sold
SOLD. 1 May 2023, Carrum VIC, 70,139km, Amber Red, second owner
2022Collecting Cars$70,000Sold
SOLD. 12 Apr 2022, Camp Hill QLD, 29,828km. ONE owner from new, eight dated Mercedes-Benz service entries from 6,212km. The top of the set
3 completed Australian sales of 3 rows. Rows marked asking, no sale, or context are shown for honesty but do not count toward the evidence grade: an ask is not a transaction, a pass-in is a refusal, and a provenance or overseas result does not price the ordinary local car. The badge on every row is computed by the same rule as the grade, so the two cannot drift apart.

Score breakdown

Against the $30k to $100k band median
94 cars in band · ink tick marks the median
Ownership economics30% of total
35/100-20
Scarcity25% of total
49/100-4
Demand durability20% of total
46/100-20
Liquidity15% of total
34/100-18
Risk resilience10% of total
22/100-14
Sub-scores run 0-100 before weighting; the weighted total is 39/100. Medians are computed live from the 94 cars currently in the $30k to $100k band, so this picture moves when the library does.
The working behind each factor: baseline and drivers ↓
Ownership economics30% weight
35/100
Baseline80 pts
− 18.3% of value a year to run-45 pts
Sub-score (baseline plus drivers, clamped 0-100)35 pts
Scarcity25% weight
49/100
Baseline38 pts
+ 242 registered in Australia, thinning as running costs deter owners+11 pts
Sub-score (baseline plus drivers, clamped 0-100)49 pts
Demand durability20% weight
46/100
Baseline36 pts
+ Supercharged/NA AMG V8 soundtrack has a dedicated older-AMG following+10 pts
Sub-score (baseline plus drivers, clamped 0-100)46 pts
Liquidity15% weight
34/100
Baseline24 pts
+ Niche market, 46 days on market+10 pts
Sub-score (baseline plus drivers, clamped 0-100)34 pts
Risk resilience10% weight
22/100
Baseline30 pts
− M113 V8 robust, but folding hardtop mechanism ages poorly-8 pts
Sub-score (baseline plus drivers, clamped 0-100)22 pts
Model output, not advice or a valuation. Verify independently before acting.

What it costs to own · about 5,500 km a year

Annual cost of access, excl. fuel
$5,500a year
Share of value per year
18.3%
Scheduled servicing$1,45026%
Tyres, annualised$95017%
Registration and CTP$80015%
Insurance$1,35025%
Sinking fund (failure table)$95017%
All-in annualised (a different number)
Purchase (model value plus duty)$31,200
Running costs × 5 years$27,500
Median exit, net of selling cost$27,308
All-in annualised over 5 years$6,278/yr
Share of value per year20.9%
Cost of access is what the car costs to run. All-in annualised adds depreciation, duty and selling costs across a five year hold. They answer different questions and are labelled separately for that reason.
Break-even appreciation, 5 year hold
15.1%a year, only to get the money back
This library projects
-1.2%a year
The projection falls 16.3 points a year short of the hurdle. On these assumptions this car is a cost, not an asset, which can be an entirely rational thing to buy but should be bought knowing it.
Purchase$30,000
Stamp duty$1,200
Running costs x 5 years$27,500
Selling cost at exit, 3.3% of the salescales with price
Sale price needed at +5 years$60,724
Storage
Bought at
No forecast is used to compute the hurdle. It is the purchase, the duty, any premium and 5 years of running cost, grossed up for the cost of selling and spread back over the hold. The projection it is measured against is the weakest number in this product and is drawn that way in the chart above. Transport, finance and any restoration spend sit outside it.

Specification

Engine5.4L NA V8 (M113)
Power / torque265 kW / 510 Nm
0-100 km/h4.9 s
Transmission7sp auto (7G-Tronic)
DriveRWD
Kerb weight1,560 kg
Built worldwide20,000
Delivered to Australia950
Effective AU survivors242
Australian sales / year55
Typical days on market46 days
Launch price$139,900

What moves the price on this model

Colour hierarchy
Fire Opal Red+4%
Obsidian Black+1%
Iridium Silver-1%
Options
Performance pack (LSD, tauter suspension)+6%
Designo paint and trim+2%
Odometer sensitivity±4% per 10,000 km vs 110,000 km
Applied on top of these

Condition, history, originality, ownership, delivery and modification multipliers apply to every car in the library. They are applied automatically when an advertisement is analysed, and the schedule is set out once, on the analyser page.

Projected value in five years

Projected value at five years
$28,308
-5.6% on today
The model's figure. Today it is $30,000.
Even odds it lands between $23,352 and $32,163.
$18,885 lowhigh $35,637
The shaded range is even money and 38% wide; the outer figures bound eight outcomes in ten. Band width follows the evidence - a model with a tight measured record carries a tight band.
A weaker five year outlook than 75% of the library.
-26.6% weakest projected move in the librarystrongest +73.1%
Five-year cost of ownership
Value change alone: -$1,692 across five years.
Running costs over the same period: $27,500.
Duty and expected selling costs: $2,200.
Net cost of five years of ownership: $31,390, or $6,278 a year.
The projected value fall is added to the running cost. Depreciation is the larger number here.

The case for and against

The case for

The naturally aspirated M113 V8 represents an older, hand-built era of AMG engineering that has developed a dedicated following as newer AMGs turbocharge. Values have risen steadily since 2016 despite the car's age and running costs.

The case against

AMG V8 servicing costs sit well above mainstream European convertibles, and the folding hardtop mechanism is a known age-related failure point. It remains a genuine niche pick with a thin market at 46 days on market.

Known faults and risks

Risk 1Folding hardtop mechanism failure
Risk 2Balance shaft/timing chain wear on M113
Risk 3Specialist AMG servicing cost
Hardtop mechanism repair$1,800
Timing chain service$2,200
Suspension component refresh$1,100

Similar cars, and what they cost to run

Evidence behind this valueThin · 3 recorded sales
Carried value
$30,000
Historical price
2016 · $22,0002026 · $30,000
Thin
No external evidence. A modelled estimate whose structure is more useful than its level.
Three Australian results and they fall almost perfectly with distance

$70,000 at 29,828km in April 2022, $54,000 at 70,139km in May 2023, $33,250 at 114,053km in June 2024. Correlation minus 0.997 and roughly 6 per cent per 10,000 kilometres.

Read the rest of the evidence notes (6 more)
The field did not receive that measurement until September 2026, and that was a plain error

This paragraph measured six per cent and the record went on carrying kmPct 1.4, which is the figure it held before these three sales were found, at the same revision that corrected expected distance from 145,000 to 110,000. A coefficient four times too shallow does not show on this page. It shows on the purchase page, where a stranger with a 160,000-kilometre car was quoted a number these three sales contradict, and it showed in the guard meant to catch exactly that, which normalises every sale with the same coefficient and reported this record as carrying 42 per cent below its own evidence when the honest figure is 16.

The coefficient moves 1.4 to 4.0,

Short of the fitted 6.0 for the reason the 981 Cayman sits at 4.5 against a fitted 7.0: three points cannot carry that steep a slope on their own.

The value of $30,000 is held

The $33,250 car is the only one of the three near the distance this record expects, it is $32,600 in 2026 money, and it has an X-pipe exhaust with the secondary catalytic converters removed. A standard car at 110,000 kilometres sits a little above $30,000 and the next result decides by how much.

The descriptions explain the residuals, which is why they are worth having

The $70,000 car was one owner from new with eight dated Mercedes-Benz service entries running 6,212km to 29,255km - an EVIDENCED odometer rather than a claimed one. The $33,250 car has an X-pipe exhaust with the secondary catalytic converters removed, and the originals supplied. Same model, same market, and the top car is documented while the bottom one is modified.

Expected distance corrected from 145,000 to 110,000

All three cars sit between 29,828 and 114,053, so the old assumption sat above the entire observed population. The value moves $34,000 to $30,000.

Sourced from the auction house directly

Rather than through an aggregator, so these are the strongest evidence grade in this library: price, date, odometer, service history and condition notes all come from the published lot page.

This page prices the model.
The report prices the car in the advertisement.

Send the link. A person reads the advertisement and its photographs and sends back what that Mercedes-Benz SLK 55 AMG R171 is worth, what to offer and when to walk away, with five years of costs at the distance you drive.

Read a real listing report

The evidence on this model is thin and the report says so on its cover. Read a complete one on a real car first. Seventeen sections, no account, nothing to pay.

This model, today$30,000
Half of sales are further out than$3,354
The report$249
13×
the price of the report: what half of real sales of this model sit further from this page's number than, on this car
Watch this model
Told when the next one is called.

One line of email when this desk publishes a call on a Mercedes-Benz SLK 55 AMG R171, or records a new Australian sale of one. Nothing else, no schedule, and on a quiet model you may hear nothing for months, which is itself worth knowing about a car you are chasing.

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SLK 55 AMG for sale?Priced by a person, $249