Engine oil Mobil or Castrol

I wouldn't limit yourself to VW brand oil only if another "approved" oil is cheaper. VW has a document listing which oils meet their spec. I use the MOBIL 1 Esp x2 (it's on the list) since the 5 quart bottles are usually cheap from Walmart.com.

I’ve ran mobil1 5w30 for a few years now with oem filter on my 1990

I use 10w40 also from Mobil 1 high mileage. A lot of our engines will have a tick on start up or once hot, if so with your Motul, switch brands to another top tier on next oil change and see if your engine likes that brand more.

Hola en mi experiencia podrías ponerle el siguiente aceite 5W20 ya sea de Castrol, Quake, o Bizol.

yo te diria q te fueras por un castrol edge 5w30

Que tal mi amigo, yo tengo exactamente el mismo carro un Mazda 2 2012 lo que podes hacer es leer el manual porque depende del clima del lugar donde lo vas a conducir (en este caso es Guatemala) segun el manual en la tabla API tenes que hecharle 10w30 yo ese uso, yo le hecho Castrol 10w30 full sintetico y cero problemas.

I changed oil with 80% Mobil 1 high mileage and 20% Lucas high mileage oil stabilizer in it, did better than just Mobil 1 high mileage 5w20 alone in summer, (very hot temperature).

M1 ESP is arguably the best oil out there. It does not shear fast, doesnt degrade with 5% fuel dilution.

I personally have used the RN17FE 0W-20 (Renault branded Castrol GTX bottles) for 10k km after the innitial oil that was filled in the factory (I don’t know which one was filled in factory). I haven’t noticed any better fuel economy but that can be tough to determine because I drove the car mainly through the winter and did more shorter trips than the original factory first fill oil that I drove with during spring and summer.

Yea mobile 1 is among the bottom end of full synthetics. Even the Walmart cheapest supertech and valvoline will slightly beat mobile 1 in reducing metal wearing.