I use distilled water + water wetter in my Spec Boxster.
I change it every 2-3 years to replenish the additives in the water wetter because the water wetter gets slowly diluted over time as I top up using only distilled water.
Water alone is a better conductor of heat (+17% heat capacity at 220F as compared to 50/50 antifreeze). Plus, in the case of a leak/incident, water + water wetter doesn't create an oily slick on the track like antifreeze.
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1999 996 C2 - sold - bought back - sold for more
1997 Spec Boxster BSR #254
1979 911 SC
POC Licensed DE/TT Instructor
...Plus, in the case of a leak/incident, water + water wetter doesn't create an oily slick on the track like antifreeze.
Exactly. Point in case... this recent Nürburgring 14 car pileup. Unfortunately, cause was preventable two ways... first running WW as opposed to coolant. More importantly someone did not fix the well documented coolant hose pop-off issue of 996/997 Turbo, GT3, GT2 and GT3RS... First hand saw a similar incident a few years ago at Mid-O when a 996's popped in Madness... 8-9 cars collected quickly against tirewall before corner worker could flag traffic.
P-car and other carnage not for faint of heart... Thankfully the injuries limited from what I've read:
LIFESAVING lesson E30 driver ignored was 'unless you/your car are on fire... stay IN your vehicle until safety personnel are on scene and advise you to exit'. He was EXTREMELY lucky on a number fronts... Not to mention the driver who stayed on track side of armco
First hand saw a similar incident a few years ago at Mid-O when a 996's popped in Madness... 8-9 cars collected quickly against tirewall before corner worker could flag traffic. 
Thankfully the injuries limited from what I've read:
Hybrid Mode
