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IS250 bringing a mixture of white and black (grey) smoke what is the problem?

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Since I changed my valves and oil seal in the top gasket after a cat block, I have noticed smoke build up when I Rev and its embarrassing. The mechanic said I need to buy new engine as the engine maybe affected. But the diagnostics doesn’t show any problem.

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Are your coolant or oil levels dropping over time? Was the engine overfilled with oil after the work done on it?

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Yes they are dropping over time.

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