On Fri, 11 Aug 2017 11:00:32 -0700, Joerg
wrote:

The BB on my MTB makes a ticking sound when warmed up, sounds similar to
a hot car engine after it is turned off. It has also develoved an ever
so slight play, just a few mils. It is an Shimano ES25 Octalink.

How long do you guys let that go before replacing?

Can anyone recommend a better quality BB for this that lasts longer than
5k miles and doesn't cost an arm and a leg?

I see Octalink bottom brackets for sale for four British pounds :-)
http://www.chainreactioncycles.com/c...t/rp-prod34653
About $5.00.

Although I also notice that Amazon wants 20-odd dollars for one and
e-bay has them for about $18.00

--
Cheers,

John B.