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Reply to "Total Base Number of Petrol engine"

A drop of 8 TBN oil to 3 over 5000 km is pretty steep.
1. Pls Check if petrol adulterated with kerosene, diesel, ethanol etc..
2. Was oil topped up frequently or not at all.
3. What is the grade/brand of engine oil
4. Check source and send for analysis Engine Oil also check for adulteration of the engine oil.

Hussam
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