I must beg to differ and throw a spanner on this one.
I myself is using oils such as Q8,Idemitsu,Mobil and ELF semi-synthetics in the past and all these while.
There is
no hard and fast rule that old junks must only use normal oil.
I dont simply settle for any cheap, off-the-shelve oils found in either Carrefour or Giant.Even Petronas oils are off my list.
There is a noticeble difference between semis and minerals, and between brands.
I only to regret this time to try out minerals (and it's coming from Idemitsu!) for my 15yr old ride cause my engine feels rough at 5000KM.
Next oil change thinking whether to go for MOTUL or ADNOC semi-synthetic or Fully Synthetic. No more minerals.
So What Brand Engine Oil U Use ? And What Brand Engine Oil Better And No Expensive ?