本文发表在 rolia.net 枫下论坛前几天借的书:
10w-30
The first number --5 or --10 identifies the cold weather temperature conditions under which the oil provides prompt cold engine starting. If oil thickens too much as it lies dormant in an engine overnight in cold weather, it won't flow readily in the morning wehn you try to start the engine. It will offer resistance, making it more difficult for the starter motor to turn the engine so it will fire up.
The numberals are comparison figures. An oil having a 5 or 10 does not mean that the oil should be used if the temperature is going to drop to 5 F or 10 F above or below zero. The two only indicate that an oil with a 4 flows mroe readily than an oil with a 10. It offers less resistance to engines starting under more extreme cold temperature conditions.
W after 5 or 10 indicates that the oil is suitable for use in winter.
The second set of numerals --30-- indentifies the warm weather temperature conditions under which the oil can be used without becoming too thin to provide the engine with adequate lubrication. This is some discrepancy among manufacturers as to how hot is hot. Some contend that oil having 30 can be used if the ambient temperature is going to be 110 F; other contend that 100 F is limit.更多精彩文章及讨论,请光临枫下论坛 rolia.net
10w-30
The first number --5 or --10 identifies the cold weather temperature conditions under which the oil provides prompt cold engine starting. If oil thickens too much as it lies dormant in an engine overnight in cold weather, it won't flow readily in the morning wehn you try to start the engine. It will offer resistance, making it more difficult for the starter motor to turn the engine so it will fire up.
The numberals are comparison figures. An oil having a 5 or 10 does not mean that the oil should be used if the temperature is going to drop to 5 F or 10 F above or below zero. The two only indicate that an oil with a 4 flows mroe readily than an oil with a 10. It offers less resistance to engines starting under more extreme cold temperature conditions.
W after 5 or 10 indicates that the oil is suitable for use in winter.
The second set of numerals --30-- indentifies the warm weather temperature conditions under which the oil can be used without becoming too thin to provide the engine with adequate lubrication. This is some discrepancy among manufacturers as to how hot is hot. Some contend that oil having 30 can be used if the ambient temperature is going to be 110 F; other contend that 100 F is limit.更多精彩文章及讨论,请光临枫下论坛 rolia.net