Hi,
If your running the 55 deg stat, then in daily driving
once its opened, if in good order it will stay open
unless you have ambeint air temp of 7 deg and less.
The idea of the Sport Stat, is to open and stay open.
When you had the head Gasket replaced did you
re- surface / skim the head ?
S54 is alloy head and should be re-surfaced everytime
the HG is replaced.
Many do not and get away with it, some are not so lucky.
Get and old thermostat, remove the centre but keep
the outer, prevents water caviataion, and fit.
If you have water temp issues with what is
effectively 'no thermostat' then its Water pump,
Rad or more likely head related.
Regards,
The Gorilla.
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