Replaced head gasket/valve stem seals and the infamous U-gasket towards the front at about 90K. I was using about a qt. every 800-1000 miles. Plugs were bone dry; however, a tech who no longer responds here once said that 103 motors mask oil consumption.
I was not experiencing coolant loss @ #5 or anywhere for that matter.
I now add about 1/2 qt. every 2000 miles. It's been said elsewhere(and maybe here) that 103 motors DO use a bit of oil.
A pro who posts here by the name of "joe p" has the expression "If it leaks, it's German" in his avitar.
These cars are definitely not as oil tight as their Asian counterparts.