Personaly I wouldn't buy one. I don't think the M103 is well suited to drag the W126 around or in this case geared that well.

If you are shopping for a gas W126 a 420SEL has a lot more power, better gearing and will probably match if not beat the 300SEL's mileage.

Plus they are common and dirt cheap to pick up. It is amazing how much 420SEL you can get for $5k-$7k.

Plus if you buy a late one you get a better sound system, interior, and traction control.

To bad the M104 never found its way into the W126, that would be a good combo.

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1999 SL500
1969 280SE
2023 Ram 1500
2007 Tiara 3200