Peadybob: I need a hydraulic oil filter for my Duerr log splitter. What is the brand & number of yours? I've tried a NAPA #1259 and it mushrooms when the splitter is started.Thanks. elandem

Oil filters are matched to the engine, not the brand of the log splitter. What engine and model do you have? A Napa filter 1259 is not an oil filter, it's a tramsmission filter number.

I realize this thread isn't new but I am posting this because
I had a similar issue with mine, maybe it helps someone...

The best solution is, I hope you still have the old one :p

Take the old filter to NAPA and let them cross you one.
That's the easy way, here's some more information:

Yes the 1259 is a hydraulic oil filter, not to be used for engine oil, however you did
Say you needed a hydraulic one... Why it would mushroom, I haven't a clue.

No, hydraulic oil filters are not matched to the engine, engine oil filters are matched to the
Engine, hydraulic oil filters are matched to the machine... In that sense it would help if you
Have the make and model number of that grinder available.

But again, the simplest way is to pull the old filter and take it with you to the store.