Perhaps I should have written that differently.

The STi does not burn any coolant, I was simply stating that when I do add coolant, I only had OEM Subaru coolant.

This is important to Subaru enthusiasts, because not using Subaru coolant or other coolants with anti-oxidants can lead to engine breakdown in Subaru aluminum blocks. I only use a 50/50 mix of OEM Subaru coolant with purified, distilled water.

Yes, I'm anal, but that's part of the reason why this STi is in such good condition.