Blue smoke is usually an indication of bad rings, which allows engine oil to be burned as you drive. The fix requires engine teardown, pulling off the heads, removing the oil pan, and removing the crankshaft, rods, and pistons. The cylinders may need to be bored, but at the least they will need cleaned up with a hone. The old rings taken off and new rings istalled. If the engine needed bored, then new pistons must be installed. Then, put it all back together.
Hope this helps you
Blue smoke in the exhaust is a good indicator that the engine is burning engine oil. there are a few things that can casue this including: bad valve guide seals, worn piston rings, worn valve guides. You need to take the van to a repair shop that you trust for further diagnosis.
Your vehicle is burning some engine oil
U might have a slight "blow by", which means ur piston rings r bad.
Blue smoke is a tale tell sign of bad valve guides, and they will need to be replaced. There are some engine additives that claim to resolve the issue, but that is not guaranteed.
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