Don't use Fram Oil Filters on Yanmar engines
Here is the deal on using non-Yanmar oil filters.Years ago Yanmar had a problem with the oil pressure sending unit. It was placed ahead of the oil filter and would gunk up and give false low pressure warnings. To fix this problem Yanmar Engineers moved the filter ahead of the sending unit and hence the sending unit know sees only filtered oil. Problem solved right ?? By doing this they also moved the filter ahead of the oil pressure requlator and hence the filter in now on the high pressure side of the regulator.All oil filters, Fram and Yanmar have pressure relieft valves built in. (Take one apart and you will see a button on the top that you can press to open). This valve is there to provide a flow by in the event the filter is clogged. (ie. You don't change it enough).Fram filters are built for applications in which the filter is on the low pressure side of the oil pressure requlator. (This is the case with most engines, diesle and gasoline). With a Fram filter on a Yanmar engine the pressure valve will stay open and you will have, in effect, no oil filter. You will not see any effect from this, looks like it fits, dosn't leak, etc. but no filtering is taking place. Yanmar filters are designed with a higher pressure releif valve. Extra costs sucks but I'll take filtered oil over non at any cost.