i personally just change oil filter half way through (not going extreme extended oci anyways, in our weather and cheap labor, and no waste disposal restrictions, just not worth it.)
for iswara, oil loss is around 200-300ml, sentra much less as the oil filter size is much smaller than iswara's oil filter.

if those semi synthetic are api sn, sure why not

official SC's are practicing 10k km/6 months even with semi synthetic these days btw

feel free to query the API directory:
https://engineoil.api.org/Directory/EolcsSearch

usually cheaper/rebranded Eneos/Idemitsu are from Singapore, you may query eneos and idemitsu brands and they are API certified
pennzoil is also API certified, just not most of UMW's outdated products lol

p1/p2 rebranded are from petronas, they typically aren't certified, however you can just go straight to the source: petronas which are API certified.

yeap you are correct, the certification does not carry over.

i was referring to just use petronas brand straight away instead
their semi should be petronas syntium 800, however various feedback is that it isn't as smooth as other brands (especially the boutique/performance brands) and it is a bit expensive for being rather "mediocre".
nevertheless you can't go wrong with it considering the proper certifications/tests

ya if they aren't certified, they are not allowed to print/use the logo.

perodua depends, but since their sc using, should be safe as well.
petronas is the one with official api certification, and yes you can get from SC or petrol stations.
.......

anyone here have any feedback about platinum oil SS 10 40?
Malaysian Brand.

so you think it might not a original product or what?
then any recommended engine oil?

*most* reputable companies just have 1 blend la.
similar to how most global cars have "1 platform" and it is just trim level difference (eg: inspira/lancer all have heaters and it made zero sense having heaters in our country laugh.gif )

the manufacturing process/RND/licensing for multiple blends = $$$ and spending more $$$ = less profit
if you did not know, having different blend = new license for API, and while it isn't expensive (to big oil companies anyways) to re-license it, it is a hassle nonetheless.

hopefully i've gotten your attention for API.
http://www.api.org/certification-programs/...ditionfinal.pdf
.....

https://forum.lowyat.net/index.php?showtopi...post&p=73190126
this?

i haven't really visited petronas.
however from here:
https://engineoil.api.org/Directory/EolcsRe...Name%3Dpetronas
they are certified anyways.
.....

Just went to Petronas, they didn't print the logo but it is written instead :
.....

haha I intend to also, I have semi of 5w30 10w30 and also mineral of 10w40, I wonder can I mix up and use up one shot, just change earlier only. Any articles can read on this ah. Ill just use it and change earlier lo, maybe half of my usual interval Ill change d. I mean Im sure it is still better than running on good quality oil but 6 months in the car already right

Try as much as possible but even if mix maybe 5w30 and 10w30 still better than using a 6 month old engine oil is it? Or I'm wrong.