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Yeah, seems that but it yes has additives, simply it's different additive package to Honda. Honda is based in classic ZDDP AW GL4 and UltraLub has multi-purpose phosphorus, other example are Motul, Amsoil, Neste/Valvoline etc.

2008 NB if MT-5 is 75w GL4 too, but formulation is very different to Elf/Total NFX 75w.

Well 1,7L drained for old oil with 170k kms is very good. Level was not the reason for any shifting quality issue. To see when really cold and next miles when oil work better.

Probably it won't cause any mechanical issue, at least at low-mid mileage. Main oil formulation is the same, one is thicker and other thinner eco-climatic-fuelsaver0,005%-cold'ish performance, well... If you buyed it, go ahead and test. But think that tought shifting, if cured with D2, could be...

Pre-2012 MTX75 was M2C200-C (75w90 GL4 ZDDP real syn). Post-2012 MTX75 was upgraded to M2C200-D2 (75w GL4 ZDDP real syn). MTX75 was not the only to be oil spec upgraded, 2010-2011 for any Mustang gearboxes changed to D2 75W too, because, officially, cold performance issues, others gearboxes...

About Mobil "meet or exceed" probably yes, I said it before to you, yes, any type of legal permission, test, claim. Yes, probably because how Mobil and others heading it, apart of other. But this is not the question. Oh yes, I writed many "examples" with oil brand and model and clear heading...

With direct injection soot and emissions are higher. It needs help with oil like mid-saps. With mixed direct-port injection soot and emissions are lower. Let's say easier to pass emissions and keep clean. It doesn't need x oil properties for that. It's a theorical reason.

I delete quoted images because simple space saving... Yes. No, at least when Fiat specs has official approval/homologation. If "meet or exceed" were legal meet like approval, then Selenia or Motul had not "approval or homologation" and other oil brands for the same spec "meet, exceed...

Yes of course, but from question-answer to... ¿Approval or Material Specification about Fiat specs? From data the Approval/Homologation is the legal claim, payed, tested from Fiat. Other term like "meet" could be anything, because has not consequences or real commitment from car manufacturer...

ACEA/API use different legal terminology, oil brand can use "meet, exceed, normative, quality level...". About car brand, usually, it has not the homologation or approval from car/engine brand when "meet, exceed, performance...", it must say "approval, homologation, certificate...". It could...

It's a approval, Fiat Powertrain name it as "Certificate for service & aftersales" or "contractual tech reference". Usually it includes any laboratory test against oil requirements or additive manufacturer (not oil brand) approval, then oil brand can get from meet to approval. In this case I did...

Yes, depend on 5w40 requirements. Thing is that M1 says meets or exceeds (no legal valor) about secret S2 requirements, so M1 knows real S2 requirements and meets it or doesn't know and claims it too.

I don't use "track" tire but I can say my best price/quality tire until today weren N'Fera Su4.

Very similar to VOA from Polaris lab that I did see, only visco little different (14,9 / 91,3).

It's typical GL4 formulation, it's not weak, well not bad at least from VOA, similar as Amsoil ,Motul, Fuchs, Shell... If ZF says GL4 it's ok. Triax recommends it for many specs, probably has not homologation, but others well known oils same.

Official oil is 75w85 true GL4, ZDDP based, false syn good quality. It's spec you should search. Redline 75w80 is very good oil, stronger additive. It's little thinner but will work same or better than official oil. Other true GL4 ZDDP 75w85 options: Redline MT-85 Amsoil Syncromesh (5w30)...

Motul has not both. It's mid GL5 additive. Motul says compatible with supposed GL4. It's "safe" with good maintance (it uses inhibitors like thiadazoline as additive and it goes down with time), anyway yellow metal wear may be higher than GL3/GL4 from any material weight-loss test vs typical...

Most well known oils will be same spec production, but probably any Asia or Arabia zone could be different (local production, import restriction or specific product characteristic). Example, there are regular additive package imports from Italy to USA to produce any oils (10-20% product) but...

For me it's not relevant cooper, it's keeping original oil + break-in time + 6 years. I don't know reasons, the problem if you want to find one, is it and each cold start after weeks or months with that oil and coolant.

D2 is last eco spec, very thin oil. C is the classic spec, tick oil. Both are mostly real syn, true GL4 and same additive. If not good reason for D2, stay with C or compatible 75w85/90 pure GL4.