QUOTE(zeng @ Mar 4 2018, 11:48 PM)
Sorry to give you another boring and repetitively similar comments ......
that there is absence of center zone in this 11400 km blotter indicating high dispersancy capability of this oil sample .
Generally the other zones are not dark indicating low level of contaminants/combustion byproducts possibly due to cleaner ( Hyundai G4GB ) engine internal conditions and adequate quality of this Aisin 5W30.
If I were you, I would continue using this 11400 km oil and do another blotter spot test in 1500-2000 km and go from there.
This Aisin 5W30 , though 'unbranded' looks quite impressive so far.
That's great, I appreciate your comment. The engine is clean because it was totally overhauled last year, after overhauled I used cheap mineral oil for 1000km, then a mineral Penzzoil for 4000km, after that I changed to this Aisin synthetic. I was planning to change this Aisin at 10000km but since it's still good, I'll extend it to 13000km.
I also never heard of Aisin before, Google said it's a Japanese company that develops and produce "engine, drivetrain, body and chassis, aftermarket, and other main automotive parts for various major OEMs", and is 30% owned by Toyota. Can't find info on where they made their engine oil though.