Stuck oil filter

I like Dave's idea for watering the manifold, but also note Martin's concerns about cracking the manifold due to the thermal shock.

Perhaps the safest way would be to begin with the engine cold and water that, and then start up.

Rod

It was something of a quick post.

It's best done with bare cast iron when cold, the water soaks into the iron a little so it's very obvious which one is cooler, it takes about 5 sec longer to dry.

Tubular manifolds don't matter and they dry so fast it takes several wettings to spot the offender.

Or use a non-contact infra red thermometer.
Quite good for working out which brake is binding too.

Bill

+1 for hammering a tool through a stubborn filter if accessible and whoever fitted it was having a temper tantrum.

pgk

Here's what I did to remove a stubborn filter.

Put 2 jubilee clips over the filter body with their worm drives aligned and tightened up.

Found a piece of pipe with id the same as the jubilee clip bands' od. In one end of the pipe cross drilled for a tommy bar. On the other end notched out a circular segment of length such that the clips' worm drives would fit into it. Put the pipe onto the filter with the notch around the worm drives and then used a tommy bar to unscrew the filter.

True, but everyone can get a bottle of water, it hasn't always been the 21st century and you might want to use it today and all it might need is a new plug lead