I've found NAPA products to be pretty reasonably priced and (I feel) if you
use something 'cheaper' you will likely end up with an item of questionable
quality. I would not jeopardize my equipment by using inferior quality
filters. Since you've identified the NAPA products you need, just go
shopping for a good price.
If you can find an automotive oil filter that will fit your engine you
can save a few dollars since the auto filters are sold in much larger
quantities which drives the prices down. Get the largest (longest) one
that fits. The extra size means extra filter capacity, and additional
Make sure the threads are an exact match - don't use a 20mm thread on
an engine that wants 3/4" thread. You can tell if there's a mismatch
because the filter will be loose and wobbly as you are spinning it on.
I'm told that the SuperTech oil filters that WalMart carries are
actually pretty good quality. And they're only 2 bucks each. Chances
are there's one to fit your engine.
Just make sure you change the filter before it clogs up, because the
bypass valve pressure setting may be wrong if it's not an exact match.
So, you're advocating trying to match an oil filter to an engine by
trial and error? Seeing how the threads match by if it's wobbly after
you screw it on? You need one filter a year and they aren't that
expensive. Unless a filter is listed in a reference guide for that
engine, I sure wouldn't screw around.
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