1991-1992 Wallace Environmental Wetl 560 SEL 5.6L

Overview

The Wallace Environmental Wetl 560 SEL represents a niche chapter in early 1990s automotive history, serving as a specialized conversion and performance-tuned variant based on the prestigious Mercedes-Benz W126 platform. During this era, Wallace Environmental sought to leverage the legendary engineering of the German flagship sedan, applying proprietary modifications to the powertrain and chassis to cater to a discerning clientele that demanded both the luxury of a 560 SEL and a unique, boutique-engineered identity. The vehicle was positioned as an ultra-premium executive transport, emphasizing refined road manners, high-speed stability, and the substantial presence characteristic of the late-production W126 series.

Engineering-wise, the Wetl 560 SEL retained the core architectural integrity of the Mercedes-Benz M117 V8 engine, though it was often subject to specific tuning protocols to optimize emissions and power delivery for the North American market. The vehicle was manufactured through a process of high-end coachbuilding and modification, ensuring that the interior appointments and mechanical refinements met the rigorous standards expected of the luxury segment in 1991 and 1992. Today, the model is regarded as a rare collector’s item, representing a period when independent automotive firms frequently collaborated with established luxury manufacturers to push the boundaries of bespoke performance.

Vehicle Overview
Brand	Wallace Environmental
Model	Wetl 560 SEL
Model Year	1991-1992
Generation	W126 (Modified)
Trim	560 SEL
Body Style	4-Door Sedan
Vehicle Segment	Full-size Luxury
Vehicle Class	Midsize Cars
Market	USA
Platform	Mercedes-Benz W126
Assembly Plant	–
Country of Origin	Germany / USA
Production Start	1991
Production End	1992
VIN Identifier	–
Base MSRP	–
Destination Charge	–
Total MSRP	–
Powertrain
Powertrain Type	Internal Combustion Engine
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	300 miles
Annual Fuel Cost	–
CO₂ Emissions	–
Greenhouse Gas Score	–
Smog Rating	–
Performance
0-30 mph	–
0-60 mph	7.5 seconds
0-100 mph	–
Quarter Mile	–
Top Speed	140 mph
Braking Distance (60-0 mph)	–
Lateral Acceleration	–
Power-to-Weight Ratio	–
Dimensions & Capacities
Length (in)	208.1
Width (Without Mirrors) (in)	71.7
Width (With Mirrors) (in)	–
Height (in)	56.7
Wheelbase (in)	121.1
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)	17.0
Cargo Volume (Max) (cu ft)	–
Turning Circle	40.7 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 SEL is a quintessential “youngtimer” that appeals primarily to collectors of W126-based variants. Reliability is largely tied to the robust Mercedes-Benz M117 powertrain, though prospective buyers should prioritize inspecting the complex Bosch KE-Jetronic fuel injection system, which can be temperamental if the vehicle has sat for extended periods. Common issues include vacuum leaks, aging suspension bushings, and the degradation of biodegradable engine wiring harnesses typical of early 1990s German luxury cars. In the current market, its appeal lies in its rarity and the “over-engineered” build quality of the era; while it is not a daily driver by modern standards due to its fuel consumption, it remains a highly respected cruiser that offers a tactile, analog driving experience that is increasingly difficult to find in contemporary luxury vehicles.