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Originally Posted by BRADDAD
Does anyone know the recommended coolant for a 96 PU 4cyl. (Is the engine aluminum head &/or block) if so it may need silicate free!
Silicate coolant
Low silicate coolant
Or Silicate free
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The engine has an iron block and an aluminum head. Silicate-free coolant would be best, if it were installed at the factory. However, with the possible exception of one '95 Nissan truck (Aaronford's), I don't think Nissan ever installed silicate-free coolant (otherwise known as DEX-COOL). Because your truck probably has silicated coolant now, your engine is already contaminated with it, and putting in DEX-COOL or its equivalent would not gain you anything. The best way to protect your cooling system is to drain and refill the coolant periodically.
For the 1996 model year (which is similar to other years), Nissan recommends changing the coolant first at 60,000 miles or 48 months. After you hit the 60k/48 month mark, change the coolant every 30,000 miles or 24 months. Basically, change it every other year and you'll be fine.