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| 1. | changing of engine oil, the lubrication of various points in the engine accessories and chassis is periodically |
| 同时,对空气滤清器进行清洁保养并更换机油滤清器(如果使用)。除了更换发动机机油,也必须定期对发动机辅助装置和底盘各个部位进行润滑 |
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| 2. | discussed causes of excessive oil consumption, oil dilution, and water-sludge formation and why it is necessary |
| 我们已经讨论过引起机油过量消耗、机油变 |
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