If you want to give your engine the maximum protection it deserves, you should replace your pressure oil screen and install an oil filter. Oil filters protect the internal parts of you engine from damage, increase you oil change interval and allow better diagnostics if you should have a contamination problem. Standard Lycoming Style Adapter, filter, gasket and special mounting stud is listed at $175.00. Thinking of making the change? Check out the link to Teledyne Mattituck. I am heading to Cecil Aero Friday morning for an oil change and making the switch to the filter upgrade. This switch will allow me to extend my service hours between oil changes from twenty five to fifty hours.