Have a 1998 Toyota Landcruiser which was converted to LPG a few years back prior to my ownership, changed the oil the moment I got it. It has been about 20k km already, and I can still see through the oil to the gratings on the dipstick, and possibly just ever so slightly darker. In my experience, this would be the point where I would change the oil in the petrol car, where the oil a dark brown and definitely not see through. There is no consumption whatsoever.
Do I leave the oil in or replace?
Do I leave the oil in or replace?