(12) (a) List three parts of automobile engine that require lubrication.
(b) Explain how oil level is checked in an automobile engine.
(c) The following are three engine oils presented for use on a vehicle:
5W-30, 15W-40 and 10W.
(i) Which of the engine oils can start a vehicle at cold condition most easily?
(ii) Which of the oils is most suitable for use on light cars in a hot weather?
(iii) Which of the oils will have the slowest flow in cold weather?
(iv) Which of the oils will have the fastest flow in hot weather?
Observation
A lot of candidates attempted this question. However, most of them could not satisfactorily answer question 12(c)..
Solution
) (i) The engine oil that can start an engine in cold weather most easily is 5W-30.
(ii) The engine oil most suitable for light cars in hot weather is 5W-30.
(iii) The engine oil with the slowest flow in cold weather is 15W-40.
(iv) The engine oil with the fastest flow in hot weather is 5W-30.