You must dilute with water and I would use distilled water. I am not sure what the different concentrations are (it is on the bottle) - normally 1 unit of coolant to two units of water is for temperate use, I unit of coolant to 1 unit of water is for extreme use - again details on the bottle.
Full functionality is not achieved if 100% solution is used and may damage your engine.
If it is safe to use at 100% I am sure the maker would give you the option after all it would make them more money.
Are you sure you mate is not talking about pre mixed coolant.
Garry
REMLR 243
2007 Range Rover Sport TDV6
1977 FC 101
1976 Jaguar XJ12C
1973 Haflinger AP700
1971 Jaguar V12 E-Type Series 3 Roadster
1957 Series 1 88"
1957 Series 1 88" Station Wagon
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