mixing engine oil

Expert

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w30 is referring to the thickness of the engine oil, the higher the number the thicker the oil.

normal cars use w30 & w40, cars with turbos will use w50

cars with turbo can use w4 too. Subaru WRX stock manual recommends w40 oil :o
 

cscs3

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I think you are confused with the number before W and after. Only the numbers before W have any relation to winter countries, ie 0W, 5W, 10W, etc. :s11:

It should be both combination. At lease my Honda car manual state it clearly use 30w only if you need to drive in cold weather. As thinner oil helps to protect engine in cold weather.

The next thing is when engine get older, you have to use a thicker oil base.
 

Dragon

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Normally w30 is used in country with 4 seasons. For local, check your car manual and follow manufacturer spec is better.

It should be both combination. At lease my Honda car manual state it clearly use 30w only if you need to drive in cold weather. As thinner oil helps to protect engine in cold weather.

The next thing is when engine get older, you have to use a thicker oil base.

W30 and 30W means different thing. This is what we are trying to tell you.

30W rating is for cold weather. It means it will behave as 30 weight oil (viscosity) at cold temperature.

W30 rating is it will behave as 30 weight oil (viscosity) at operating temperature (eg 100c).

Hence you have oil ratings such as 0W30, 5W30, 10W30, etc. Hope this clarifies. :)
 

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This is just one school of thought.

When a car has passed 20~30k, whatever metal shavings/dust already long gone compare to brand new. Basically it just need a lubricant not necessary must be thicker oil.

Sent from Samsung SM-N9200 using GAGT

This old theory of using thicker oil on older car comes from the statistic that the piston rings and bearings haven worn down, hence the sealing is not good anymore and using thicker oil helps slow down the "eating" of engine oil..

It is just a temporary measure :s22:
 

americanhippo

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W30 and 30W means different thing. This is what we are trying to tell you.

30W rating is for cold weather. It means it will behave as 30 weight oil (viscosity) at cold temperature.

W30 rating is it will behave as 30 weight oil (viscosity) at operating temperature (eg 100c).

Hence you have oil ratings such as 0W30, 5W30, 10W30, etc. Hope this clarifies. :)
paisei.

So 30W and W30 are both referring to different things.

So there is such an oil 30WW30?
 
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