Does this engine coolant look ok? This is a sample from my coolant tank which looks very dark inside. I haven't been paying attention to the engine coolant in my 2011 5.0 f150 (bought it used at 111k miles and its at 134k now) for a while and am not sure if this looks good or not. I've only been keeping up with the oil.

 

2 tests that need to be performed to determine condition. Looking at it won't cut it however that coolant looks clean to me. Seeing as you bought the truck used it probably would be best to drain and refill at the very least.

#1 Specific gravity using a hydrometer for coolant.
#2 Electrolysis level using a volt meter.

Specific gravity will tell you how cold it'll stay fluid and how hot before it boils. Volt meter place one lead on the battery + terminal and the other lead in the coolant directly, if it reads more than 1V it's time to replace it.
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Thank you for the help. I will be getting the proper tools to do those tests.

 

Item 2, neat trick. Is this true with any type of coolant ?

 

Yes.
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