don't know how Mexico does it, but in the USA the Sparks are factory filled with Semi-Synthetic 5-20 and CANNOT be filled with ANYTHING OTHER THAN 5-20. If Dexos-1 certified oil is not available, any 5-20 with the API starburst will be acceptable. If you put synthetic in it, you're exceeding Dexos1 standards anyway, so Mobil1 5-20 will be just great. Dexos2 in the US is for diesel specs, and do never ever ever fill it with anything other than 5-20 if you're in the US.