- Jan 3, 2006
I read through the nearby thread on oil filter sizes, but I had a question of my own. The stock filter for my 1977 MG Midget is considered unavailable, because it used a 5/8" pipe nipple originally. Many folks have converted the pipe nipple to 3/4" so more commonly available filters can be used. I have no idea what dimensions the original filter were. When I first got my car, it had already been converted. At the time, I found a site that cross referenced older parts with more modern equivalents, and the wisdom was that it can use the same filter as a Saturn 1.9 engine (any of the 1990s Saturns). So I've usually used a Bosch 3330 since that what's called out for a Saturn. I was suprised that Autozone now calls out a filter for the MG, with the note that the adapter is needed, but it calls out a Bosch 3422, which is much longer than the 3330 (4.7 inches vs. 3.3 inches). Any idea why it would call for such a huge filter? It seems to me if it's mounted sideways (i.e., impossible to pre-fill), then the huge one means it will take longer to fill after an oil change. I give it an oil change once a year, and it doesn't see more than 1000 miles a year. Am I correct that there's probably no benefit to using the big filter?