what type of oil to use in a 225?

71Scamper said

OEM recommends 10w-30. Don't forget that modern oils are lacking the zinc additive needed to keep our classic engine alive. I would recommend buying a high zinc content oil or buying the additive. Stay away from Synthetics because they have even less zinc in them.

And for gods sake don't cheap out on an oil filter!

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Yeah, same advice here. Add some Royal Purple or Lucas zinc additive. Get a good oil filter. First filter I bought was a generic "value" filter. The oil drains back into the pain when the engine is off. I could here rod knock for the first couple of seconds after start up. The engine was already well worn and loose when I got the car. Who knows what condition it woulda been in if prior owners all used top shelf filters.