Your low mileage may actually be part of the problem. You have an 11 yr. old car that's been driven only 54,000 miles. Things dry out when they sit idle for extended periods of time and that can cause leaking.

As Stu Ritter said, 103's leak at the right rear corner.

There have been many posts here that indicate the 103 chain is more or less timeless. If the oil has been kept clean I'd doubt you'd need to change it.
New valve stem seals and a head gasket will drop any oil consumption you may have been experiencing way down.