I installed a spin on oil filter adapter a few months ago on my 1950 Olds 88. Got the adapter from David Homstad of Rosemount, MN. Telephone (952) 432-3596 or email DHomstad@chater.net It is very important to follow the instructions on installing the adapter. Make absolutely sure you do not have a old gasket left in the area where you are installing the new one. Unless you shine a light in there, you will probably not even see the old one. Long story short, you will NOT get a good seal IF you have an old gasket in there. Permatex Ultra Copper is the recommended sealant. It takes about 24 hours to cure. I'm using AC Delco Oil Filter PF1218 which I believe is a GMC truck one and it has a little more capacity than some others. So far, it has worked like a champ. David's adapter is a high quality heavy duty one. I think I'm getting a slightly higher oil pressure reading too.