Installing engine oil temperature gauge - TJ

I usually use the Purolator Pure One filters. As a reference point, the local Advanced Auto store has the filter books out on the rack with the filters and they all are really specific about the difference between those two threads. Since my 88 uses the 20mm mount, I'd bet on yours wanting the 3/4 size - but check the book.

I don't like Fram filters - never have, never will. I use Purolator mainly because I can find them about anywhere and have never had a problem with them but there are others out there. The Mobile filters are supposedly OK, but I've never tried them.

Thanks Will, I have so far been using Mopar filters simply because they are easier to get than after market ones here in New Zealand. Apparently its not a common filter type in our part of the world (or so I have been told by auto part stores).

I was going to use the Fram or Purolator filter as a reference number to figure out what the thread and o-ring diameter was on this engine.

I have read somewhere that the Mopar filters which are 20mm thread have "20" marked on their faces that mate with the block. Obviously I can't test it without taking out the filter, second thought, I can ask to see a new filter at the dealership tomorrow and see what it says.

Thanks for all your help and time in replies to my queries. TW