ic ic ic, bro....this is from my experience. just use regular semi-syn (if ur engine din makan minyak). i say this because after i've done my washer thing, lifter noise was on a gradual improving trend. what i mean is lifter noise reduced from week to week and oil change to oil change. by reduced i mean after week 1, lifter was already working like new with no tik tik tik.....and the situation has been improved by so much that now i complain about my K&N breathing sound while idling !! with old engine, i din expect my lifter/HLA to operate like new, so i only get the tik tik noise when cold start in the morning, but that also for the first few revolutions on the engine (that is only at max 1 second). once oil is pumped up to engine head, no lifter/HLA noise at all. therefore, no need to experiment with different different oils any more bro....lol, like i said, sumtimes i just go whacky..
here is the long elaborated story of how my lifters came back to lives and haunt me, lol
after adding the extra washer, it was all okie.. den, i found out dat joshua eliminated the ticking diesel noise in a modified hilux turbo diesel by using a mono50 weight oil. dat diesel was running smoothly witout the well known clatter of any diesel engine.
after sum time, i cam to a shop and accidentally saw a mono40 weight oil, and the crazy light bulb in my head lit up, lol. just to try maa, u know? if a mono50 is able to quiet down a diesel, den a mono40 weight oil shud be able to help a petrol, at least in my case to keep the noise suppressed down. during dis time, i found out dat my fc got better, but 2 days after i poured 200ml into the crank, i notices a slight noise dat is very well known, a slight only.. den, worrying dat the noise wud get worse, i decided to try a well known oil additive (again, wit the crazy bulb..), the bardahl-1 and the slight, slight noise again disappear for a couple of days.
today, the noise isnt apparent, but as i said the fc got better and iam still on my last fuel fill, 20hengget since last tuesday, it has been around 200km since den
hope this info helps.