Porsche - opinions

Porsche (1981)
Porsche petrol engine 2.0 year 1981+gas installation , mileage of 320 000 km (confirmed)-the car bought from friend. Applied Ceramizer- engine additive- one dosage Reason: an oil consumption, smoke- symptoms of a worn out engine. After an oil replacement into mineral Mobil One, one dosage of an additive was applied. After making 300 km a noiseless engine operation followed. Besides an oil consumption was decreased (after around 2450 km).The car still produces smoke – it seems that it is of the same level or even less.
Mariusz G.