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Diesel engine oil have higher viscosity and base number than gasoline engine oils
beside the additives in diesel engine oil is more than that in gasoline engine oil
Diesel Engine oil (DEO) generally has higher S content, hence the DEO would have higher TBN. Currently 9 to 10.
Due to larger amount of contaminents in diesel fuels, it has larger dosage of detergents.
Gas Engine generally has lower Sulphur content, henvce the TBN is lower. Currently 7 to 8.
In operations the Gas engine tends to run a bit hotter.