thermostat question

[jpliddy]

hi all
i have been reading here the remarks about ideal thermostat temperature !
im sure mine is 87 degrees fitted by me few years ago .
volvo genuine part what ever make that is .
ive read you recommend a 80 degree thermostat .
do i need to change mine ?
i do not drive the car under great stress except a foot down now and then to
clear the black soot then its only just over 3000RPM
the engine done 276000miles now so i want to give it the best chance of a long
life .