Yes we log our oil changes. My partner and I keep a log in the plane
(which is actually an Excel SS) in which we record the pilot, date,
tach start/stop & hobbs start/stop times & flight hours. I use this
to generate an invoice for both of us each month by transcribing what
we've written down into the SS. Formulas calculate the rate x hrs
flown. I also have a tab that keeps track of our hours flown year to
date and percentage of flying by partner.

In the lower right corner I enter the tach time at oil change. The
next cell down I enter the interval (40 hrs) and the cell below that
is simply the two cells added together to show when the next oil
change is due.

If anyone is interested in my SS, I'd be happy to share it. There is
some data entry involved, but I enjoy my personal race to the next
"level" of hourly experience, such as 200, 250, 275 hrs, etc.

Greg H.
N4691X

ghopp @ no.spam ohliqdotcom