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Question

what happens to an automobile motor oil when the engine heats up?why is it important to have a heavy motor oil in the engine during summer and lighter in winter?

i need this question for a science test review. please help me!!!!!
help will be greatly thankful.

Answer 1

you use heavier weight oils in the summer because the heat, causes the viscosity to be less. In another words is that the oil flows too easily when hot--and fails to lubricate, allowing metal to metal contact. So you use a oil that flows under heat but lubricates well.
In the winter you have the opposite problem--you need oil that flows easily to that it doesn't gel in the oil pan (kind of like how olive oil will not flow if it has been refrigerated). For that you use a light weight oil--so that it is able to flow threw the pick-up tube, filter, and surfaces that need to be lubed.

Answer 2

the viscosity of the oil is called the weight of the oil like 30 weight or 10/40 HD (high detergent) that helps to clean and lubricate the engine and cylinder walls ------- the heavy oil does not break down and the viscosity remains constant in warm/hot weather and as the ambient conditions change to colder it is not required to have heavier oil in the engine because the lighter oil will heat up and flow better ----- you need to print this out and use the dictionary to look up these words so you can discuss this in your class... wc

Answer 3

first, when your car gets burned, the oil turns heavy , like glue
and you have to have heavy oil during summer, ´cause the oil´s function inside the engine is lubricate the engine´s parts, so the oil condition have to be the best,so you have a light oil in summer...the engine´s parts could be damaged because in summer the oil gets so light, and in winter the weather is so cold, so the oil have to be more light, because in winter the oil gets so heavy.

i will explain you in less words.. :D
put some oil in your pan at the stove...the oil is so heavy...
now turn on your stove and the oil inside your pan goings to get more light

bye

Answer 4

Oil breaks up, gets thin and loses viscosity when it gets hot, that's why you need thicker oil in the summer. In the winter you need thinner oil cuz cold oil gets thicker and thick oil doesn't pump through an engine very well. That's why they have multi-climate oils like 10w30, 15w40.

Answer 5

when engine get hot,the engine oil get hotter and can not cool down the engine parts. during winter,you want the engine oil thinner so it can flow easier to lubricate the engine parts. have you ever try sucking a thick milkshake out of a straw?see how hard it is. during summer time,you want thick oil to cool down the engine. the purpose of the engine oil are to clean the engine parts,cool down the engine,and lubricate the engine parts. now go check your oil level

Answer 6

take some pancake syrup.. put some in a cup in a microwave and a cup in the fridge or freezer.... motor oil does the same thing...when its really hot out, oil thins rapidly, which requires a thicker oil (10W30 or 15W40) and in the winter it gets well, like pancake syrup and dosent flow easily through the oil galleys in the engine and dosent lubricate properly, so you need a lighter oil (5W30), hope this helps!!

Answer 7

Yes, in the winter the lower number on lets say a 10W40 is the cold waether oil weight. The W in the 10W40 means "Winter" The high number is the oild weight in warm weather. So winter 10 weight, summer 40 weight. Go here.....

http://auto.howstuffworks.com/question164.htm