Comparing the 2.6 L and 3.0 L
The Mercedes Benz 2.6-liter M103 was almost mechanically identical to its larger 3.0-liter stablemate. The only difference between the two engines was an increase in bore from 82.9 mm in the 2.6-L to 88.5 mm in the 3.0-L variant, smaller intake valves and a slightly different air box. The 3.0-L M103 with a catalyst produces 177 horsepower at 5,700 RPM and 188 ft.-lbs. of torque at 4,400 RPM while the version without the catalyst generates 185 horsepower at 5,700 RPM and 191 ft.-lbs. of torque at 4,400 RPM.

3.0 L Swapability
Due to the mechanical similarities between the 2.6-L and 3.0-L variants of the M103 engine, swapping them out between models is moderately easy as it's as simple as a bolt-on process, without any extra fabrication. Those seeking to gain a performance upgrade by swapping in the 3.0-L engine can find this larger power plant in the 1986 through 1993 W124 300 E, the 1988 through 1989 W124 300 CE, the 1988 through 1993 W124 300 TE, the 1989 through 1991 W126 300 SE, the 1989 through 1991 W126 300 SEL and the 1985 through 1989 R107 300 SL. It was also offered in the W463 G-Class SUV, but this model never made it to the United States other than through the gray-market.



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