It's fine to mix brands of anything. But I'm not sure what you mean by grades. You should not mix weights of oil. Similarly you should only mix the same DOT classification of brake fluid and only if it has remained sealed against moisture. Radiator fluid should only be the blue or Honda classified type. You should not use green or orange in it.I'm trying to declutter my garage and found a few quarts left of different grades and brands of engine oil. is it safe to mix them in the 2005 MDX? What about brake fluid and radiator fluid?
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