This has been discussed way too many times.

Think logically - if such a big supermarket chain was caught selling fake oils and someone sued the company, let's say Exxonmobil sued the supermarket brand for selling fake Mobil1, you think Te5co would have a chance? Worlds 2nd largest company that is cash rich suing a supermarket chain supposedly distributing 'fake' Mobil1 world wide, the damage to Te5co would be huge both financially and reputation wise.

These large supermarket chains get their oils from their European counterparts. How do I know? I work for Exxonmobil. Local distributors are quite annoyed that Te5co and all can sell the oils so cheap but if you look at the local packaging it's different and apparently so is the additive package in the oil. So it's up to you to choose Euro blend or Asia blend Mobil1 when buying.

Heavy oil? xW40 is one of the most widely used viscosities in the whole world. It's only just recently (in the last 5 to 10 years) that cars started focusing a lot on efficiency and tighter tolerances that's why you start seeing xW30 and xW20 oils as a base requirement for cars. Don't compare with countries that require the low viscosity to run optimally la, I'm talking about in general.

SM and SN isn't that big a deal breaker. Look at what Quazacolt has shared in the thread (I think the first page).

Old oil is a possibility. I don't know the Te5co purchasing cycle but since they ship their oils from Europe, it's minimally at least 6 months to 1 year old once it's in the stores locally.

Yeah why not? It might perhaps wear out faster but that really depends on environment, usage, etc.

The additive package is different no matter how you look at it comparing the AP and EU blends. What the exact differences are, I wouldn't be able to tell you. But the claim is AP blends with our weather and humidity (etc) in mind, so technically the AP blend is better. But that's not saying the EU blend is useless here. It'll still protect your engine but the question is to what extent? So perhaps the AP blend can last 12k km, the EU one maybe no more than 8k before your engine starts feeling sluggish.

It's hard to say. I'm not a chemist so can't really tell you much and even if I were, I'd be contract bound to secrecy even though I work in Exxon.

Why not? Long before engine oils start packaging in Asia, they were all imported from Europe or US too. FYI I've been using oils from Tesco/AEON on my 12:1 compression engine for almost 4 years now and it's still running just perfectly fine, no issues whatsoever! Before that for >10yrs I've been using imported oils direct from either Europe or US on my previous cars, also all compression ratio around 10.5-11:1, also all running perfectly healthy despite the very high temps and daily going thru horrendous traffic jams, and often driven very aggressively to red lines. So as long as you buy good reputable oil brands which matches your engine requirement, then it should be just fine.