The car has 62K miles on it.
I only work three days a week, so the car will sit for the most part during the days I don't work.
Thanks for the update.
I really think that your best plan would be 3-4k miles or 3-4 months and change it out with dino or blend.
I have a 2000 Silverado V-8 powered 4x4 ext cab truck with 41k miles that sees about 5-6 ONE mile trips a week and sits a ton and I have it on a 3 month oil change. It's coming up to 3 months and it's seen 1,500 miles (which is a lot but I've been driving it to work which is 120 miles round trip here and there) but still will change it out.
With Gas going up, it's going ti sit even more..
Had a valve cover gasket replacement on one side due to leakage and it looked new inside.
6 quarts of Pennzoil, Chevron, QS, Halvoine,or any name brand oil and a $2 supertech filter is well under $10 since I buy my oil on sale.
Oil is cheap, I recycle the used oil so it's not going down the drain somewhere.
I would not want to go over 6 months with ANY oil.. Some folks would and great, But $4-5 oil is too expensive in this driving style....
The varnish I would not worry about. It's not going to do any damage.
I'm in the mindset that you want to change the oil and get the ugly stuff out more often...
Take care, Bill