Blown gasket! Due to different coolant?

[AMMsterz]

Had my '07 Aveo 1.4 LT Sedan checked at the Chevy Service earlier, having noticed oil leaks around the engine head yesterday -- seems to be getting worse... The Chevy employee insisted that the head gasket must have blown, needing immediate replacement; had the car inspected elsewhere for a different opinion but they suggested the same... Seems at this point that I'll have to do with paying up as I've researched what sort of nightmares might ensue from head gasket failure...

The point now, however, is could this be due to the usage of a different coolant? What happened was, nearly a year ago, resulting from coolant leakage, the reservoir had to be replaced... The previous coolant (orange, if I'm not mistaken) was flushed and replaced by what was recommended at Chevy Service (Caltex Extended Life Coolant, which is reddish). The manual suggests silicate-based; the Caltex coolant reads something like "meets the silicate-free standards..." I'm really concerned that this may somehow adversely affected the engine...

Ever since I spotted the oil leak, the coolant level has noticeably dropped... I'm a noob so not sure if that info would help in any way.

Additionally, distilled water or any water to top off the cooling system?

Appreciate any help
Peaceage