[TR] who often should I change oil in a a less frequently used LBC

[Randall]

My opinion, change it every year if the engine has even been started (0
miles).

Whenever the engine is started, some of the combustion gases leak past the
rings, carrying along water and the makings for "acid rain".  If the engine
is driven enough to get the oil good and hot, then it boils off the water
and acid.  Otherwise, the additives in the oil must deal with it.  The
additives don't last forever.

I have seen several engines badly gunked up by taking only short trips, and
only changing the oil every 3000 miles.  The mess inside had to be seen to
be believed!

-- Randall