Gearing is not that bad, I have not driven my 560 in a while but I seem to remember cruise RPM @ 65mph around 2300. I guess you could source yourself the taller 2.24:1 diff to drop the RPM a few hundred.

The CIS not not great for fuel economy (all injectors fire at the same time...), nor are the two huge cats on the car, nor is the Y connector of the manifolds that forces the M117 to breathe through a straw. Starting in second gear around town does you no favor for economy either.

How old is your O2? The older it becomes, the richer the car tends to run.



If all your forward gears are fine, just replace the reverse clutches and reseal the unit while out of the car. You should easily get to 200k+ on the rest of the internals. One of mine is creeping up on 275k.

__________________
I'm not a doctor, but I'll have a look.

'85 300SD 245k
'87 300SDL 251k
'90 300SEL 326k

Six others from BMW, GM, and Ford.

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