1991-1992 Wallace Environmental Wetl 560 SEC 5.6L

Overview

The Wallace Environmental Wetl 560 SEC represents a unique chapter in the history of specialized automotive engineering during the early 1990s. Based on the legendary Mercedes-Benz C126 platform, the Wetl 560 SEC was a bespoke conversion project that sought to refine the grand touring capabilities of the W126-based coupe. Wallace Environmental, a boutique firm known for its niche automotive modifications, focused on enhancing the powertrain efficiency and interior appointments of the 560 SEC, catering to a high-end clientele that demanded both the classic German build quality of the era and a distinct, personalized touch.

Positioned as an ultra-luxury personal coupe, the vehicle retained the iconic pillarless hardtop design that defined the Mercedes-Benz flagship aesthetic of the 1980s and early 1990s. The engineering philosophy behind the Wetl 560 SEC centered on maintaining the robust M117 V8 engine architecture while optimizing the vehicle for specific environmental and performance parameters. Despite its limited production run, the car is often cited by enthusiasts for its exceptional road presence and the seamless integration of custom luxury features into one of the most reliable chassis ever produced by the German automaker.

Today, the Wallace Environmental Wetl 560 SEC is considered a rare collector’s item. Its legacy is tied to the “tuner” era of the early 90s, where firms sought to elevate factory-standard luxury vehicles into bespoke status symbols. As a bridge between traditional grand touring and specialized automotive craftsmanship, it remains a testament to an era of over-engineering and uncompromising material quality, appealing to collectors who value the historical significance of limited-production, coach-built luxury vehicles.

Vehicle Overview
Brand	Wallace Environmental
Model	Wetl 560 SEC
Model Year	1991-1992
Generation	C126
Trim	–
Body Style	2-Door Coupe
Vehicle Segment	Luxury Coupe
Vehicle Class	Compact Cars
Market	USA
Platform	Mercedes-Benz W126
Assembly Plant	–
Country of Origin	Germany
Production Start	1991
Production End	1992
VIN Identifier	–
Base MSRP	–
Destination Charge	–
Total MSRP	–
Powertrain
Powertrain Type	Internal Combustion
Engine Family	Mercedes-Benz M117
Engine Name	M117.968
Engine Code	–
Engine Configuration	V8
Displacement	5.6 Liters
Bore x Stroke	96.5 mm x 94.8 mm
Compression Ratio	10.0:1
Aspiration	Naturally Aspirated
Fuel Delivery	Bosch KE-Jetronic
Valve Train	SOHC, 2 valves per cylinder
Engine Block Material	Aluminum Alloy
Cylinder Head Material	Aluminum Alloy
Oil Capacity	8.5 Quarts
Oil Specification / Viscosity	10W-40
Horsepower	238 hp
Torque	287 lb-ft
Redline	6000 rpm
Drivetrain	Rear-Wheel Drive
Transmission	Automatic 4-spd
Final Drive Ratio	2.47:1
Axle Ratio	–
Fuel Economy
Fuel Type	Premium Gasoline
Recommended Octane	91+
EPA City MPG	11
EPA Highway MPG	15
EPA Combined MPG	13
Fuel Economy (L/100 km)	–
Fuel Tank Capacity (gal)	23.8
Estimated Driving Range	–
Annual Fuel Cost	–
CO₂ Emissions	–
Greenhouse Gas Score	–
Smog Rating	–
Performance
0-30 mph	–
0-60 mph	7.2 s
0-100 mph	–
Quarter Mile	–
Top Speed	140 mph
Braking Distance (60-0 mph)	–
Lateral Acceleration	–
Power-to-Weight Ratio	–
Dimensions & Capacities
Length (in)	193.3
Width (Without Mirrors) (in)	71.9
Width (With Mirrors) (in)	–
Height (in)	55.5
Wheelbase (in)	112.2
Front Track (in)	60.6
Rear Track (in)	60.2
Ground Clearance (in)	–
Curb Weight (lbs)	3900
GVWR (lbs)	–
Towing Capacity (lbs)	–
Payload Capacity (lbs)	–
Passenger Volume (cu ft)	–
Cargo Volume (Behind Rear Seats) (cu ft)	15.0
Cargo Volume (Max) (cu ft)	–
Turning Circle	39.4 ft
Approach Angle	–
Departure Angle	–
Breakover Angle	–
Safety Ratings
NHTSA Overall Rating	–
NHTSA Frontal Crash	–
NHTSA Side Crash	–
NHTSA Rollover	–
IIHS Award	–
Small Overlap Front	–
Moderate Overlap Front	–
Side Impact	–
Headlights Rating	–
Front Crash Prevention	–
Technology & Connectivity
Infotainment Display	None
Instrument Cluster	Analog
Apple CarPlay	No
Android Auto	No
Navigation System	No
Audio System	Becker Grand Prix
Speaker Count	6
Wireless Charging	No
Wi-Fi Hotspot	No
OTA Updates	No
Digital Key	No
Warranty & Ownership
Basic Warranty	–
Powertrain Warranty	–
Corrosion Warranty	–
Roadside Assistance	–
Complimentary Maintenance	–
Specs.Autos Exclusive Data
Engine Assembly Plant	Stuttgart, Germany
Transmission Supplier	Mercedes-Benz
Gear Ratios	–
Differential Type	Limited Slip
Cooling System Capacity	–
Roof Load Capacity (lbs)	–
Safety Recall Count	–
Production Volume	–
Units Sold in USA	–

Consumer Insights & Market Appeal

The Wallace Environmental Wetl 560 SEC is a vehicle that demands a specific type of owner—one who appreciates the mechanical integrity of the W126 chassis but understands the nuances of maintaining a limited-production, vintage luxury car. Reliability is generally high due to the proven M117 V8 engine, though prospective buyers should be vigilant regarding the Bosch KE-Jetronic fuel injection system, which can be temperamental if the vehicle has sat for extended periods. Common issues to monitor include vacuum leaks affecting the idle and transmission shifting, as well as the degradation of biodegradable wiring harnesses common in vehicles of this era. In the current market, the Wetl 560 SEC appeals primarily to collectors seeking a unique alternative to the standard Mercedes-Benz offerings; while it may not command the same premium as a factory AMG model, its rarity and the “coach-built” allure ensure it remains a stable and highly respected asset in the classic luxury car segment.