That's maybe 1/2 a quart of oil. Did you change it when you bought the car?

Green coolant is not ideal. Not instant death, but not ideal. The best bet for coolant is Zerex G-05. You may have to ask for it at the local auto store. Some keep it "in the back".

That cable doesn't look like a factory piece I've ever seen.

As mentioned your vacuum system will need some help. Do your automatic door locks work? How about the climate control system?

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The shop that changed the rear trailing arm, axles and bushings did an oil change as well, so that may be the source of additional motor oil. I'm not sure about the type of oil they put in, so I'm thinking of changing the oil filter as well as switching to Mobil 5W40 Turbodiesel Truck oil when I do the valve adjustment.

Alright. We'll get that changed out ASAP, then.

Great! I'll assume it's not critical, then.

None of the above, though the car is getting a new set of ceramic-copper fuses today. It's been displaying a certain amount of endearing (but ultimately annoying) electrical quirks, and a quick check of the fusebox revealed several fuses that had reached the end of their useful lifespan.

The transmission has also been displaying some occasional hard shifting, which leads me to believe that it isn't receiving enough vacuum. I'd like to ultimately reduce the vacuum system to a bare minimum--enough to ensure proper operation of critical functions, and plugging off the rest.

Regarding the light smoke at idle and the poor(ish) fuel economy, I'm hesitant to come to any conclusions (and/or get unnecessarily concerned) before I do a valve adjustment and replace the leaking injector fuel lines.

The shop that changed the rear trailing arm, axles and bushings did an oil change as well, so that may be the source of additional motor oil. I'm not sure about the type of oil they put in, so I'm thinking of changing the oil filter as well as switching to Mobil 5W40 Turbodiesel Truck oil when I do the valve adjustment.

The car is getting a new set of ceramic-copper fuses today. It's been displaying a certain amount of endearing (but ultimately annoying) electrical quirks, and a quick check of the fusebox revealed several fuses that had reached the end of their useful lifespan.

The transmission has also been exhibiting some occasional hard shifting, which leads me to believe that it isn't receiving enough vacuum. I'd like to ultimately reduce the vacuum system to a bare minimum--enough to ensure proper operation of critical functions, and plugging off the rest. Door locks don't work, and neither does the climate control. But that could be due to the fuses, as well.

Regarding the light smoke at idle and the poor(ish) fuel economy, I'm hesitant to come to any conclusions (and/or get unnecessarily concerned) before I do a valve adjustment and replace the leaking injector fuel lines.

Coolant will be changed ASAP.