Coolant, liquid to transfer heat. Better than water alone bacause it contains chemical that prevents corrosion in your radiators.

185/75/14H

185 - Width of your tyre in mm.
75 - Aspect ratio, or the profile of the tyre. 75 is a thick one. Sports car uses low profile tyres such as 45, 40.
14 - Size of the rim that this tyre fits in inch.
H - Maximum speed that the tyre manufacture recommends.

S - Up to 113 mph.
H - Up to 130 mph.
V - Up to 149 mph.
Z - Over 149 mph.