a) Grease
b) Crankcase breather
c) Relief valve
d) Oil pressure gauge
Answer: a
Explanation: Grease is a semi fluid lubricant, used for slow moving parts. It is useful for those parts, which are connected and are not easily accessible, such as universal joints, water pumps, wheel and axle bearings. Grease consists of a mixture of mineral oil and metallic soap along with a few other chemicals.
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