I just wanted to post up about Oil Flushes, now ive never bothered with them, the only reason i did one was because the bloke at autobarn threw it in when he said he couldnt match another shops price on the Oil i was after. btw only reason i went to autobarn was because every other distributer was out of Motul Power 15w50 which i run in my old thrashed RB20 which sees a lot of track work, my reccomendation for engines with a few more K's which see a bit more hard work.
anyway, so ive had my oil pressure gauge for a few years now, and with 5w30 castrol edge (bad choice), 10w40 turbolight and 15w50 power the pressure has never really changed a great deal. anyway, so ive only recently changed to Power from turbolight, in fact the oil i was about to drain was my first batch of Power. so at the same time i did this change i did oil filter and this flush (Nulon i think). so same oil, same brand filter (Ryco) only difference was the flush.
10psi gain in oil pressure on idle, no f**king shit lol. it used to sit just over 1bar, now it sits just under 2bar. dont ask me how, i dunno, it was completely unexpected.