oil pressure problem

[K4000JB]

hi guys
as title suggests oil pressure on the other halfs mx5 dropping just below 30 momenterily (bouncing) on idle and on acceleration bouncing above 60psi which isnt necessary a bad thing but also on driving it it starts to tap quite loudly then disappears it sounds a bit like the tappets but doesnt happen when the car is idling. any suggestion? oil pump or pressure relief valve maybe?
cheers

[DennisTheMenace]

Fit a genuine filter and do an oild flush and see what happens , ive got a dummy guage in mine so by the time it warns me my engines toast!

Ive also got a temp guage that wants to be a shift light
http://smg.photobucket.com/albums/v402/DennyRobert...

Edited by DennisTheMenace on Tuesday 25th March 21:23

[K4000JB]

thanks for the reply i have changed the oil every 3000miles and used a genuine filter also i have tried wynns hla cleaner which didnt seem to do a great deal. the car has done 100k miles is it about time the oil pump was changed? or do they suffer with sticking oil relief valves? any opinions welcome