Answer Posted / bejoy

sorry guys i won't agree to u guys...
i would say the question itslef is incomplete as normally
diesel engine is more efficient than a petrol
engine(surprise!!??)

yes..diesle engines do require a lot of maintenance due to
its his vibration and operating temperature etc.. if not
maintained the efficiency goes well below that of a petrol
engine..
at same cc.. a diesel engine has more efficiency..infact its
efficiency can be made a lot better still by adding
turbochargers annd VVT and using CRDi etc..

the reason is that in diesel engines better combustion
occurs(higher compression+more air)..
take care..

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