I just checked the engine oil condition for my cars back home.

1) 13 year old vios with 215k on ODO. Last oil change was 10k km ago, used tesco fully synthetic (topped up a little 2 months ago with shell helix hx7 due to some oil consumption), colour looks like dirty cooking oil, strong petrol chemical smell but no burnt smell.
2) 4 year old santa fe diesel, 70k on ODO. Last oil change was 4.5k km ago, used shell helix hx7, colour comes out black, no burnt smell.

Question :
Is it normal for diesel oil to turn out in that condition after just 4.5k km? This car has gone through regular servicing in hyundai service centre and engine flushing was done for alternate oil change interval.

Does this mean that i have to use engine oil with stronger detergent or API rating? Shell hx7 is rated for API CF though.

I realised I didn't fully understand what was stated in the attachment. In fact, CJ rated engine oils are suitable even for Malaysia Euro 2 grade diesel. Readings can be found in the FAQ in API website.

http://www.apicj-4.org/faqs.html (see item 7)

that is some interesting information you got there, you in O&G by any chance?

i'm not particularly looking into diesel so my info can be very limited.

yea i've posted before on xw16 which i am really looking forward to it since i've been on 0w20 myself

=edit=
wow nice pdf, have some clarification on base oil grouping as well!
pinned that doc from infineum on first page

is it true that if you are on 10w30 and experience regular engine overheating, switching to 10w40 (or perhaps fully synthetic) would likely solve the overheating problem?