Mercedes SLS AMG R197 Engines — The Complete UK Guide
Every engine fitted to the SLS AMG Roadster — the hand-built M159 6.2-litre naturally aspirated V8 in 571 bhp and 591 bhp GT forms, plus the 631 bhp Black Series. Real UK replacement costs and honest reliability data on AMG's gullwing icon. Backed by real UK enquiries in 2025 [MB-VERIFIED].
Explore R197 Engines
Mercedes SLS AMG R197 Engine Codes — The Complete Database
Every engine fitted to the SLS AMG Roadster specifically — the M159 6.2-litre V8 in standard, GT and Black Series forms.
Overview
Mercedes SLS AMG R197 — Overview
The Mercedes-Benz SLS AMG Roadster R197 — the open-top version of the gullwing coupé — was introduced in 2011 as a 2012 model year car.
While the C197 Coupé celebrated the legendary 300 SL with its gullwing doors, the R197 Roadster offered a fabric soft-top that could be operated at speeds up to 50 km/h, folding away in 11 seconds. Power came exclusively from the hand-built M159 6.2-litre naturally aspirated V8 — a heavily developed version of the M156, featuring dry-sump lubrication, forged internals and over 120 unique components. The Roadster was offered in standard 571 bhp form, the uprated 591 bhp GT specification from 2012, and the extreme 631 bhp Black Series from 2013. The SLS AMG was the first Mercedes-Benz designed from scratch entirely by AMG. Production of the R197 Roadster ended in 2014.
Key Facts
Platform
Mercedes SLS (aluminium spaceframe)
Predecessor
Mercedes-Benz SLR McLaren
Successor
Mercedes-AMG GT (C190)
Sibling body styles in this generation
C197 Coupé
Market Intelligence
No [MB-VERIFIED] enquiry data exists for the SLS AMG R197 — the model is absent from EM_Proprietary_Data's per-model table, reflecting its low-volume, ultra-premium UK status.
Best & Worst Engines
Thin-Data Summary
“The SLS AMG Roadster's engine range is defined by one legendary powerplant — the M159 6.2-litre naturally aspirated V8 — offered in three states of tune. The standard 571 bhp M159 (SLS AMG Roadster) is the purest expression of AMG's naturally aspirated V8 era: 6208 cc, 420 kW, 650 Nm of torque, and a spine-tingling 7200 rpm redline. It's a hand-built masterpiece with dry-sump lubrication and forged internals. The 591 bhp GT variant offers an additional 20 bhp and a slightly sharper chassis setup, with the same fundamental reliability as the base engine. The 631 bhp Black Series is the ultimate evolution — higher redline (8000 rpm), revised valve train and intake routing — but it's rare and its extreme nature means higher running costs. The M159 is generally considered more robust than its M156 predecessor, with improved valve buckets and revised camshafts addressing many of the earlier engine's weaknesses. However, the dry-sump system requires specialist maintenance, and the engine's complexity means repairs are expensive. Buying instruction: all three variants share the same fundamental M159 architecture — choose based on budget and desired specification. The standard 571 bhp car offers the best value; the GT adds a worthwhile power bump; the Black Series is for collectors and track-day enthusiasts.”
Who it's for:
Mercedes SLS AMG R197 — Ownership Economics
The R197 rule
A £8,000–£14,000 M159 recon against a £60,000–£150,000 R197 sits at 5–23% of the car's value — well within the 70% Mercedes threshold for almost every example. Even the Black Series' £12,000–£20,000 recon sits at 8–33% of a well-kept example's value. The SLS's strong residual values mean engine replacement is almost always financially viable — the question is whether the car's overall condition and mileage justify the spend.
Key Takeaways
Which R197 Costs Least To Own?
Standard 571 bhp M159 — the most common variant, best parts availability.
Which R197 Costs Most To Own?
Black Series (631 bhp) — rare, higher-strung, specialist-only maintenance.
Which R197 Is Best Value?
Standard 571 bhp M159 — the purest expression of the M159 with the lowest running costs.
Common Problems
R197 Engine Replacement Costs — By Engine and Condition
Core Variants
Core Variants
Petrol Variants
Scope note: All variants listed are R197 (SLS AMG Roadster, 2011–2014) only. The C197 Coupé shares the same M159 engine but is covered on a separate Generation Page per the one-page-per-body-code rule. The GT variant (591 bhp) was introduced in 2012; the Black Series (631 bhp) was introduced in 2013.
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FAQ
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