Engine block
Cylinder head
Exhaust manifold
Oil sump
Minimise the friction
Increase the friction
Increase the wearness
Increase the noise
Provide a cushioning effect to oil filter
Increase the wear and tear of the moving parts
Increase the blow by gases by providing an oil
Minimise the wear and tear of the moving parts
By injecting water solvent
By injecting oil solvent
By injecting fresh air
By cleaning tools
Check visually
Check with special tools
Check with computer
Check with bore dial gauge