Automobile Engineering in ME
The engine oil viscosity is defined by ___________ ratings.

Gross vehicle weight (GVW)
Automatic transmission fluid (ATF)
American petroleum institute (API)
Society of automotive engineers (SAE)

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Automobile Engineering in ME
The compression ratio in petrol engine is kept less than in Diesel engine because

It is just customary to have less compression ratio in petrol engines
Higher or equivalent compression ratio in petrol engines is not possible due to pre-ignition
Less compression ratio gives better performance
It makes petrol engines lighter

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