I find it safe to buy branded genuine Shell/Castrol/Mobil/Total from Tesco/Giant/Aeon Big either online or hypermarkets.
Hong Kong or Thailand fonts etc should be ok, not saying all those 'guerillas' could be trusted though .... so do exercise care.
If you must get only Shell Ultra 5W40, then your choice is limited other than unknown online 'guerillas'.

No difference , all genuine branded oils (like Shell etc) from overseas that is blended to a certain API and/or ACEA specifications has similar additive package as 'registered' with API/ACEA.
Hence they are suitable for cars in importing countries that recommends the 'appropriate' specifications.

Say for example , your MB xyz car recommends oils with 'MB approval 229.5' and there is a 'genuine' Shell Ultra 5W40 with:

....whether blended in Hong Kong, Thailand or UK would carry the same additive package approved by Shell (International) , and hence this oil is suitable for ALL MB xyz cars across the world.
However , do note the quality of gasoline used though as in sulphur ppm which would influence the oil change intervals, not oil suitability!

TS, give a try to this guy and report back,
http://www.11street.my/productdetail/shell...CFUGijgodi5MH_A

Disclaimer:I have no interest in 11Street and this reseller.
'Genuine' Shell oil here does not mean oils from Shell Malaysia, which are real pricy and cut throat.

This post has been edited by zeng: Nov 24 2017, 10:24 AM

Depends on the car also, but generally your comment is valid too in local scenario.

If TS' car calls for MB229.5 or BMW LL-01, then this Ultra 5W40 is suitable. Most semi-syn does not comply.

But if it's used on Japanese or Korean petrol engines calling for SN/SM , then using Ultra 5W40 for <8000 km OCI is a real waste.
Btw, I run 16000+ km with a Total Semisyn 10W40 A3B4 in a 2005 Avanza and blotter spot test pictures shows no problem.
Currently hitting 10000 km, I have no plan to change out in the next one month or two.

TS, head to the nearest Giant store promotion at RM99.90 for 4L Shell Ultra 5W40...... today.
It's product of EU ..... surely is genuine.

Btw, it's production date is December 2016 ........ refer picture just below "A3/B4".

This post has been edited by zeng: Nov 24 2017, 09:31 PM

Glad that your immediate requirement is sorted out nicely, and real value for money.
Btw, what's your typical OCI oil change interval so far ?
With a free and easy Blotter Spot Test, you may be able to assess the quality of this oil and also engine condition.