How long can you stretch the interval if you barely drive the car?
Car gets driven to Max temp every time it's driven
Just curious. Can you go 5 years at 1k a year?
There's not a lot of info on your part.....year, brand, model, engine, etc..
I'm going to assume the car sits for long periods of time, like a week or more. I'm also going to assume there's no issues or design/inherent flaws or built in.(the reasons you should give more info). No warranty, etc..
1) Put the car on an automatic battery tender, a trickle charger that shuts off and on automatically. Set it up properly. Make sure nothing is in there that can get caught or melts when you start the car or when engine is hot. The units themselves will melt if you leave them under the hood and run the car.
2) At least once a month, if not less, plan a longer trip somewhere for something where you can drive the car, without shutting it off, for a minimum of 30 minutes, if not longer, preferably at a steady speed but even if not.
3) When doing #2, turn on all electronics for the first 20 minutes. Everything. ...all the electrical buttons, including AC, headlights, etc.. The literal translation of the word "everything". Leave them on for a long time, you can toggle between them. This is especially true/necessary on an older car.
4) Use a quality oil from a well known brand with the specs for your engine(i don't consider Fram and some others to fit this, for example) and go ahead and change it every 5 years along with the filter. I, however, consider 5 years to be a hairy edge. To me, 3 years is very reasonable and super doable for your application/wants. ...but you do you and go 5 years, just use quality oil.