When I flew fractional, we obviously checked engine oil on every pre/post flight, and would supervise the FBO personnel servicing it. Same for O2. Nav databases were updated by MX when the aircraft went through a base. The most we did was swap the new database to active when the old one actually expired.

I wouldn't imagine many companies specifically instructing pilots to get up on a ladder (that they aren't specifically trained to use) and service oil on the jet...it's a fall risk and an OSHA/workman's comp nightmare waiting to happen.