How often to change oil in old Pontiac that isn't driven much?

My grandma drives a 1994 Grand Prix with about 113k miles on it. She doesn't drive much (maybe 5-6k/yr) so she doesn't change the oil much. However, the car must leak or burn oil b/c I check it once in awhile %26amp; it's almost always low. For example, she got an oil change back in April %26amp; has driven about 2k mi since then - I just checked %26amp; it was almost a quart low.



I'm not an expert, but it seems she should change her oil more frequently b/c even if I add oil (which I do) the filter will still be dirty - right? It seems like if there isn't enough oil for a period of time the oil %26amp; filter will get gunked up more quickly than usual. I would like to know what to tell her %26amp; it would help to get an expert opinion! I guess I should also note that we live in an urban area %26amp; probably 60% of the driving is in town. Thanks very much!How often to change oil in old Pontiac that isn't driven much?Considering her driving, I would suggest an oil and filter change every six months, regardless of mileage.How often to change oil in old Pontiac that isn't driven much?Every 5 - 6 K miles.How often to change oil in old Pontiac that isn't driven much?JUST CHANGE IT EVERY 2 YEARS