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Welcome to Tbhp. Regarding the grade, I would stick to what Ford has recommended for the 1.5 TDCi. If 5w40 has been recommended, you can go ahead. 5w40 may result in a minor loss in fuel Mileage.

C2 is fine - roughly equivalent to a5b5 but also suitable for bs6 petrol as well as diesel cars. SN+ instead of SN means the car works for tgdi turbo petrols as well.

Castrol just updated the spec I guess.

If your pocket suits it get 5w30 or 5w40 castrol edge longlife which is acea c3 but about 3k++ a litre. Amazing oil - butter smooth even after 9000+ km in my Endeavour.

Thanks sir for your kind advice , would definitely try the same at the next service probably within 6 months . Hope you are talking about this product (image attached) .:thumbs up

Yes this is the one.

So changing oil for my Creta, car will be used in Delhi so temperatures can touch 45+, I have narrowed it down to 5w40 then, have some great options like Shell Helix Ultra or Motul 8100 Xcess. Hyundai for some reason also says to go for 5w30 ACEA A5/B5 when possible for higher fuel economy .
Question rises then, the oils that do meet these specification are few, Amsoil Signature series is one and Hyundai's own Shell Fully Synthetic is another, this is also what I have presumably used since the beginning but the price charged by Hyundai is pinching now, it costs comfortably 2 to 2.5x as compared to other 5w30 or even 5w40 (albeit ACEA A4/B4) oils.

Upon digging deeper I concluded it all (ACEA A5/B5 vs A4/B4) has to do with higher Viscosity and a HTHS of less than 3.5.
So, is it that big a deal and I should absolutely get an A5/B5 5w30 oil or an 5w40, A4/B4 (There are no A5/B5 5w40 oils in existence) would be better suited for my driving conditions?

Also this effectively rules out any Diesel specific ACEA E7/E9 kind of oils like Amsoil 5w40 which has a super high HTHS of 4.3, we are aiming for high viscosity and low HTHS, right?

5w30 A5/B5 as well as 5w30 / 5w40 A3/B4 are more or less the most common spec of oil available on the Indian market from Shell, Castrol, Mobil, Valvoline, even Indian Oil, BP etc. You can get dirt cheap oils like Castrol Magnatec or Mobil Super 3000, no need to buy Amsoil if you don't need an expensive oil.

You could try 5w30 ACEA C2 or C3 if you like as well which Idemitsu and Castrol have available (castrol edge 5w30 or 5w40 acea c3 is extremely expensive but highest quality).

For the present with the distribution of Shell Mobil and Total being what it is, the best alternative to buy off a retailer seems to be Castrol Magnatec 15W40 for Diesel Engines.

For synthetic 5W40. A better option in these parts this year than 5W30. The summer temperature has been over 45 Deg. C for weeks together.

Magnatec is also available in 5w40

https://www.castrol.com/en_in/india/...#tab_suv-5w-40

Yes that is the fully synthetic version. They have the EDGE range too. But again low distribution depths.

Thanks a lot for the quick response, first of all for usage in Delhi (and high ambient temperature here) which one should I go for, 5W30 or 5w40? My Car is Creta 1.6 Diesel.

Secondly for 5W30 fully synthetic A5/B5, I could only find the aforementioned Amsoil Signature and Castrol Magnatec along with Hyundai's Shell fully synthetic which works out to be around ₹6.7k for 5.3 litres. (Unreasonable), what other options are there?

And if I can go for normal A3/B4 oils, which one would you recommend? Since a good oil like Motul 8100 XCess 5w40 is available for ₹3.5k for 5 litres, lets keep the budget around that.

P.S Budget can be increased as well if an oil is substantially better but since most cost in that vicinity I kept it at around 3.5k, Hyundai was anyways charging me more than 6.5k for the past 5 years so anything less or less and better is still money saved.

Go for xxW40 grade oil. 45 degree plus ambient temperature definitely needs a thicker oil.

Your engine is a far higher temperature than 45 degrees. And your car has coolant right? Don’t worry about lower viscosity oils - people happily use 0w20 in the Arizona desert in the usa.

First time got my Octavia TDI 2016 model serviced outside Skoda, and went with Meguin 5W-30 engine oil. So far I feel the car has become more smooth. Any feedback / suggestion on this from the forum?

You are right.
But I choose either equal or slightly higher spec oil. If recommendation is 5w30, I will either choose 5w30 or 5w40 or 15w40.
The reason being:
-We all know thicker oil protects better.
-Thicker oil doesn't allow dispersed impurities to settle quickly and form sludge.
-Thicker oils are so soothing to the ears. Unnecessary engine noises are reduced significantly with thicker oils.
-It is free insurance :) Let me explain. In an untoward incident like radiator leakage or oil leakage itself, a thicker oil will help protect your engine longer if it starts to overheat.
Recently, our Santro was driven without coolant and it overheated. The radiator was having a huge leak and had to be replaced. The engine is still intact and as smooth as before. I was using 15w40 CI4 oil in it. Oil is split between our Santro and Safari (hence this super thick oil; I buy 10L can usually).

Image: Radiator being replaced in our Santro.

Yes, I let go of ~2% mileage gain expected with thinner oils. Similar mileage gain is expected if I shed a few kilos from my body, but I let go of that as well. lol:

Please read : https://bobistheoilguy.com/forums/th...s-thin.350758/

Yes it is a bit controversial but that guy is spot on about engine operating temperatures.

Thanks to modern additive chemistry thicker oil isn’t the cure all for hot weather it once was