BMW 1-Series Forum (F20) 135i - 1Addicts.com > Second Generation 1 Series Forum > 2012 BMW 1-Series Sporthatch (F20) Discussion > Servicing intervals (aus)
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      11-05-2013, 08:05 AM   #23
ovekvam
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But oils with a larger span between the values, like 0W-40, usually degrade quicker than oils with lower span, like 5W-30.

Here in Norway, the recommended oil for our 116i is Castrol EDGE Pro. BMW LL04 0W-30.
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      11-05-2013, 09:44 AM   #24
Callthecops
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Quote:
Originally Posted by BenArcher View Post
I think you may have some facts crossed. 5w-30 is only thicker when cold, it is thinner than 0W-40 at operating temperature. As such 5w-30 does not minimize leaks, instead it offers improvements to fuel consumption/power. Whilst 0W-40 provides better flow at start up and better engine protection at operating temp.

Really though outside of a lab you would struggle to tell the difference.
To make sure no misinformation is spread by myself

- 0w-40 flows like 0 grade when cold and 40 grade at operating temperature.
- 5w-30 flows like 5 grade when cold and 30 grade at operating temperature.

So the "just use thicker oil to prevent leaks" is a myth?
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      11-05-2013, 09:53 AM   #25
ovekvam
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Quote:
Originally Posted by Callthecops View Post
To make sure no misinformation is spread by myself

- 0w-40 flows like 0 grade when cold and 40 grade at operating temperature.
- 5w-30 flows like 5 grade when cold and 30 grade at operating temperature.

So the "just use thicker oil to prevent leaks" is a myth?
These numbers are index references. The first one relates to the temperature at which the oil can flow when it is cold. Lower number means it can flow at a colder temperature.

The second figure refers to film strength at high temperature. A lower number means thinner oil.

Also notice that the film strength index is also affected by the first number in some cases, like 5W-40 compared to 15W-40.

So none of these figures are measurements directly in some unit. You have to look up the index to see what the range is.
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      11-05-2013, 08:16 PM   #26
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Quote:
Originally Posted by ovekvam View Post
Here in Norway, the recommended oil for our 116i is Castrol EDGE Pro. BMW LL04 0W-30.
You're also in a much cooler climate then here in Australia. I bought 0W-40, purely because of the higher strength at high temps. Where I live it never ever gets below 0degC in winter, but during our summer it is quite often in the high 30's to mid 40's.
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      11-06-2013, 12:51 AM   #27
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I used 5W-50 for an interim change at 7,500k. My service indicator is now saying 4,500k to service (with 10,500k on the odo). Which may answer several questions in this thread. And raise several others
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