I wonder what they're for!

bjdw, Jan 19, 10:19pm
Just doing an oil change and noticed that there are three (bolt!) holes around the outside of the face that the seal of the filter fits up against.Any idea what they might be there for!Nissan Sentra GA14DS

poohy99, Jan 20, 5:00am
Wild guess, an oil to coolant heat exchanger.

morrisman1, Jan 10, 5:54pm
I was just gunna go have a look at mine but then I remembered where it was and thought f**k that