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The stock Model T has no oil filter. Many aftermarket "upgrades" are no such thing, but something to remove debris from the oil in your T is a good idea. That is the transmission oil screen sold by most of the Model T parts dealers. It's good to install the screen and clean it every time you do an oil change. Here are some suggestions on installing the screen.

BE VERY CAREFUL NOT TO DROP ANYTHING INTO THE TRANSMISSION WHILE REMOVING OR REPLACING THE COVER OR SCREEN!!!  It's very inconvenient when a foreign object falls into the transmission. Sometimes it turns out to be EXTREMELY inconvenient.

You will be removing and replacing the cover to clean the screen many times. You can scrape off the remains of the old gasket and install a new one many times, or you can do it once. 1 Clean the mating surfaces (lid and hogshead) of oil and old gasket remains. 2 Smear one side of the new gasket with Ultra Black and stick it on the bottom of the lid with the holes lined up. 3 Smear the bottom (down side) of the gasket with Ultra Black. 4 Smear general purpose grease on top of the hogshead where it will contact the gasket. 5 Install the lid, tightening the screws enough to flatten the sealant against the hogshead but not fully tight. 6 After the sealant has had time to set up, tighten the screws. You have made a permanent reusable gasket. Whenever you remove and replace the lid, just apply new grease to the hogshead. If you are using a transmission screen (you should), you can use two gaskets and follow this procedure to make permanent gaskets on both the bottom of the screen and the lid. Simply apply fresh grease to the top of the hogshead and the top of the screen each time.

Before removing the lid I put in a couple of guide studs (⁵⁄₁₆" cap screws with the heads cut off) that make it easy to get the lid on straight and hold it in place while I put in the screws. Putting them in before removing the lid assures that they won't fall into the transmission. HOME VEHICLE INDEX