1986 Ram B-250, 8 cylinder, with approx 70,000 actual miles.

Rusting, faded conversion van.

I'll sell it to ya cheap--if interested,  let me know.

Driven very infrequently/sporadically.

Let's say  that I've put only 5--10 thousand miles (more or less)  on
it since the last oil change and the air filter replcement at least 2
years ago.

Please make me feel bad by speculating about what damage I'm doing to
it.

I'm kinduv reluctant  to change the oil.

Why?

Well, many years ago, I had this terrific '68 VW campmobile van.

I don't know if the transmission oil was ever changed by its first
owner, while I did have it changed.

Well, of course, that cost me a  transmission (over a thousand bucks)
by having the fluid changed.

Yes, I realize that engine oil changing and trans oil changing aren't
equal.

Nevertheless, I'm ... superstitious if not foolishly dumb.

If I put some garlic tablets down the oil thing, will that ward-off
something bad when I get it changed?

Don't answer the above; but please tell me if there's something I
should do (maybe pour something into it) before I get it changed, such
as STP or Marvel Mystery?.

I may have already done this some months ago (magic marvel stuff)--no,
that was in another junker i was driving, though it didn't seem to help
it.

It's a 1998 Daewoo Nubira presently sitting on my drive way with a very
questionable trans-axel.