Right now there is a non turbo W123 for sale in my neighborhood, and it's in great shape, and it also is very clean.

However, I have a few questions:

1) Other than power (88 hp vs 120 hp), what are the main differences between the two?

Here is what I know:

1) HVAC system is worse on the older cars, with the dreaded servo that usually has sellers saying "it just needs a recharge" when it's really more than that.

2) NA W123s are cheaper usually than Turbo models.

3) What is a realistic expectation for fuel economy? Mid-high 20s combined?

4) Is the transmission a 3 or 4 speed automatic?

5) What should I look for other than the usual rust, vacuum leaks, etc?