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E36General discussion and technical help for (E36) 1992-1999 3 series cars. 318, 323, 325, 328.
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Your Ride: 1995 325i
It depends on the type of coolant you were using, pre-mix or not. As the name implies, the pre-mix formulations are already set to pour into the system, the non- requires the addition of water. In your present circumstance, you're probably okay, but see below...
There are a few important things to bear in mind. First, use a modern formulated brand of coolant, I believe BMW requries one without borates, silicates, or phosphates. Second, optimal coolant performance comes with a 50-50 mixture, which is something you don't have to worry about with the pre-mix types. Third, if you do add water, use distilled water, not tap. Fourth, if you haven't done it in the past three years, you should thoroughly flush your cooling system, meaning radiator AND engine block, and put in new stuff.
3050rpm's advice was excellent. I would add a couple of notes:
1) I presume you added only a pint or two, so if anything, you most likely brought a typically over-lean coolant mix closer to 50:50. You certainly did no damage.
2) Speaking from the bitter experiences of myself and others who have posted, it is best to bite the bullet and use BMW branded coolant. You can get it on line much cheaper than at the dealer. Avoid DexCool coolants.