Quote:
Originally Posted by BoxsterSteve
The original stuff for your vintage is a yellowish colour.
You can top off with genuine Porsche coolant, which has been superseded by a pinkish coloured product, or risk the sky falling by using G12/G13 Volkswagen coolant (oh shock and horror) as I did when it was time to flush and replace my water pump.
I wouldn't risk generic auto parts store coolant for risk of gelling due to incompatible chemistry.
I couldn't tell the difference between the VW and Porsche stuff, they both tasted the same to me. 
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Since it's not too far below the min, i'll try distilled water first. When my new cap comes and it still leaks, then I'll just flush out the system, fix the leak and go on from there.