Hilux 4x4 Forum

I did send it back to the dealer ,now the dealer say they suspect its fuel contamination, dont know what that means.

i recently bought a 2011 3.0 D4D Double cab, drove it for 5 days and now white smoke is pouring out the back and the engine sound like someone is shaking nuts in an empty tin and shaking profusely....
What can it be ?