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5W-30 vs 5W-40 & 5W-30 vs 0W-30
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11-12-2015, 08:21 PM | #1 |
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5W-30 vs 5W-40 & 5W-30 vs 0W-30
1. What is the difference between 5W-30 and 5W-40? Is 5W30 thinner, better in cold temp start?
2. What is the difference between 5W-30 and 0W-30? 3. What is the difference between 5W-40 and 0W-40? Just want to know the differences are. Thanks |
11-12-2015, 08:27 PM | #2 |
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1. 5w30 is thinner than 5w40 at 100c and 40c.
2. 0w30 has lower viscosity at 40c than 5w30 3. 0w40 has lower viscosity than 5w40 at 40c.
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11-13-2015, 12:59 AM | #3 |
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So i live in Canada, which winter can gets lower than -40C. Is it 5W30 better than 5W40, if so, would 0W40 be better than 5W30?
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11-13-2015, 07:44 AM | #4 | |
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most 0w40 are not that thin in cold about 75cp at 40c. 5w40 are even worse at 40c so keep away for cold temps. I have seen many 5w30 that are thin in cold and also 0w30 wich is my favorite. So fing a 5w30 or 0w30 ll01 oil that is 60-70cp at 40c, that is the best bet. I cant imagine how thick it gets at -40c. You use engine heater or something? Oil manuf. specify viscosity at 40c and 100c, they should be required at 0c as well, the cat will be out the bag then. Imagine pistons pumping thru molasses. Note, some manuf specify ccs cp at low temps. Lower is better.
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Last edited by Sgop335; 11-13-2015 at 09:09 AM.. |
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11-13-2015, 11:38 AM | #5 |
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I'd get an engine heater. But, 0w30 is your best bet either way.
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11-13-2015, 12:33 PM | #7 | |
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11-13-2015, 04:13 PM | #8 |
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It doesn't really matter, there are universal products available. Alternatively, he could get a race-spec oil warmer for the engine while it's in the garage... not the most practical but it would be awesome and get the job done
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2009 E92 335i M-Sport - MHD Stage One - BMW Performance Exhaust - BMS Oil Catch Can - CDV Delete - K&N Panel Filter - Arc Angel H8 bulbs - Gloss Black Kidney Grills - Painted Reflectors - VRSF Charge Pipe
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11-14-2015, 01:14 AM | #9 |
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do you have any recommendation for oil warmer?
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11-14-2015, 06:19 AM | #10 | |
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OP, "W" rating is a measure the pressure required to have the oil flow at -40 Deg. C. It is a complex engineering topic, but all you need to know is a 0W weight oil flows better in colder temperatures than a 5W weight oil and so on.
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11-20-2015, 11:12 AM | #12 |
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11-20-2015, 04:20 PM | #13 | |
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My proof why castrol and Mobil 1 is horrible You're welcome http://www.animegame.com/cars/Oil%20Tests.pdf |
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11-20-2015, 05:36 PM | #16 |
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Cool article. One of the requirements of a ll01 oil is a3 b4 specs. These look at hths viscosity short for high temp high shear. The requirement is greater than 3.5cp. This is very important esp for 335 turbos. Under high temp and shear oils w/o that spec oil will fail. Rp does not publish hths viscosity on their hps oils. Their standard 5w30 is only 3.1 and doesnt meet the spec. May be not important for your 328 tho, enjoy.
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