In an earlier contribution to this discussion,
Dave Plowman (News) wrote:


Lack of compression can be down to many different things. Used to be
often plain ol' wear and tear on bores or rings -

And quite often due to burnt out valves - which piston seal wouldn't fix!

ISTR that the trick was to use a compression tester to measure the
compression pressure, and then see if it was improved by squirting oil in
through the plug hole. If it was, it was the pistons/rings which were
leaking - and piston seal might help. If it wasn't, the fault was
elsewhere - probably valves.
--
Cheers,
Roger
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