Re: changing oil
I change the oil on the race car, the Totally Awesome Missus Murff maintains all the other vehicles.
When the kids were still living at home the driveway would look like the entry to a zippy lube about every 6 or 7 weeks as she would do her car, my car, the kids cars, and the the 1 or 2 'spare' vehicles we always seemed to have.
Some years back I had a 3.8 Taurus that pooped the heads. She R & R'd the heads, did a valve job, basically rebuilt the top of the engine.
I wouldn't even change the air filter on the dam thing.
I am a lucky sumbatch!