Fitted it yesterday, was easy enough, had to loosen oil pressure switch to get the stat housing past it, the old oil stat will not open even with a blow torch aimed at it, so not sure it will make the heater any better, but you never know.
As I use the 90 so infrequently it could be months before I can report back if it has improved matters, and as it will soon be summer!
Maybe not the source of the problem but it definitely sounds like something to be fixed.

Good luck.
 

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