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please help on 2003 Chevrolet Venture

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
i dont have a manual for this , wondering what type oil is best, and losing little antifreeze per mnth and motor gets hot why
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Hello , i am asssuming that the engine is a 3.1 litre engine .. The best oil to use is giong to be 10w30.. these engines are notorious for the lower intake manifolds to leak coolant , if it is leaking it needs to be replaced along with the oil change.. If the vehichle has dex cool coolant in it, replace it with the normal green coolant or a universal type coolant ,, dex cool eats up gaskets, and creates many other problems
ur saying dont use dexcool? just normal antifreeze? correct, and thank you for ur response