Coolant type

[duped]

I am trying to find out what type of coolant my 2000 Mercruiser Horizon 350 MPI uses. I like to keep spare fluids on board and I have no idea what to buy. I think it uses dexcool?, it looks pink or maybe orange in the recovery bottle.

Anyway, I would like to match whatever it had originally to avoid issues should I need to top up or change it. Is the “Mercury extended life coolant” they sell today okay or did they change something between 2000 and now?

 

[Alumarine]

From the service manual. You shouldn't need extra antifreeze unless the system springs a leak.
I would just use water until I got it fixed properly.

"We recommend that the coolant section of closed cooling system be filled with Extended
Life Ethylene Glycol 5/100 Antifreeze/Coolant mixed 50/50 with purified water.

In areas where the possibility of freezing does not exist, it is permissible to use a solution of
rust inhibitor and water (mixed to manufacturer’s recommendations).

If any non-compatible coolant is added to this coolant, coolant must be changed every 2
years or 400 hours, whichever occurs first.

All coolants other than Extended Life 5/100 Ethylene Glycol Antifreeze/Coolant must be changed every 2 years or 400 hours, whichever
occurs first.

Mercury MerCruiser V-8 engines can use any type of permanent antifreeze or any brand
antifreeze solution that meets GM specification 1825M."