This is the "rules" at my HOA, regarding oil changes. This is a high end neighborhood, all my neighbors are doctors, surgeons, and lawyers. I would petition to have AT LEAST oil changes added to the approved list of vehicle maintenance procedures.
Motor Vehicle Repairs. No Owner of any Unit, nor a member of his family, guests, invitees, licensees, or lessees, shall engage in the construction, reconstruction, repair or maintenance on the Unit of any motor vehicle, regardless whether said motor vehicle is owned by the Owner; provided, however, that an Owner may wash and/or apply polish, change a tire, or change the oil (provided that used motor oil shall be disposed of in the manner required by law for such hazardous materials) on his own motor vehicle on Owner's Unit. There shall be no repair, assembling or disassembling of motor vehicles, except inside the Owner's garage.
As to the HOA, what can they do if you change your oil for 45 minutes? What is their enforcement level? Are they just going to ask you not to do it again? If that's the case, change the oil and forget about them. If they have no enforcement action, then consider it a rule without teeth.