I recently purchased a 1931 8-67 Sedan. I am new to ownership of 1930's vintage cars. Car as has basically sat unused since 1992, although it has been started occasionally. What should i do in terms of the factory oil filter? Based on the manual, there is no replaceable element in it, the entire unit was replaced back in the day. What do people do now in terms of replacement? Is there a correct reproduction unit? Could I/Should I install a modern, spin on, universal oil filter in the circuit and how difficult would that be? thanks