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Best Engine oil

Lubrication

It is a more important part of engine health because without engine oil engine does not start frequently either start the engine without Engine oil engine components are damaged properly and engine also are seized 🚙

Engine oil replace at a period of time for engine health engine oil replace 10k km or 1year whichever earlier because it's have a 2 reason?

Basically engine oil have a intermolecular forces and reduce friction capability
So, your engine are when running this time engine oil temperature are so warm and when you off the engine this tempareture are slowly drop to cool ,so this reason engine oil molecule are broken when oil condition are hot and comes together when engine oil tempareture are  too low and this system are continuously going around 1 to 10000 kilometre so, 10 after engine oil capability are not same before,these  is a reason why we are change engine oil after every 10k service

Another person says my car are going on just a 100 kilometre in 1 year so why I changed engine oil ?

This is a good question oil need to change for your car health because your engine oil continuously same area covered up to 1 year and don't circulated any parts of engine for this reason oil's are so thick and this condition if you continuously run your car engine may be risk and bad effect on your car engine and this cause may damaged any parts.

Engine oil have a some grade 

•  0w20
•  5w30
•  5w40 (Synthetic oil)
•  SAE80w
•  SAE90w

 SAE stands for( SOCIETY OF AUTOMOTIVE
  ENGINEERS)

0W20,5W30 and 5w40 are engine oil used in petrol and diesel engine also
SAE 80w is used in Differential
SAE 90w is used in Transmission
Engine oil have a filter it's called oil filter
and it's have a oil cooler  that's are combined unit

Malfunction light 

When engine oil pressure are too low car dashboard cluster metre have a malfunction warning light which warned you

Fluid

A fluid a substance that deforms continuously when subjected to a tangential and shear force or however a shear stress may be
Fluid are different in lubricant
It's used in brake and clutch
It's have some grade
Dot3
Dot4 according to the use of boiling capasity 

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