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  #1  
Old 01-21-2014, 10:50 PM
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Talking 0w 20

Here in the north east & it's been getting into the teens & twenties a-lot. My oil change was due as per my maintenance schedule. So I decided after much deliberation & research to go from mobil1 5W 20 synthetic to 0W 20 mobil1 synthetic. It's supposed to be better for cold starts & for efficiency. I can say only this much fresh change & it seems to be running really smooth & maybe psychological maybe not but even in the snow were getting here in the north east w/ 4 wheel drive selected she seemed like she was living in ECO mode. If so that's great as far as my wallet is concerned!
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Old 01-22-2014, 09:40 AM
GrayhemiST GrayhemiST is offline
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Is it safe using the 0 weight in these hemi's?
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Old 01-22-2014, 09:48 AM
Ezekielguy86 Ezekielguy86 is offline
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Quote:
Originally Posted by GrayhemiST View Post
Is it safe using the 0 weight in these hemi's?
Im wondering this as well. Ive always thought we had light weight oil to begin with.
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Old 01-22-2014, 10:47 AM
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5W is what we use in Canada for the wintertime, so there's not much need to change to 0W.
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Old 01-22-2014, 10:51 AM
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Guys the 0w has nothing to do with operation at temperature. It only comes into play on cold starts and the 0 weight gets up into the engine quicker than the 5w will. It will improve MPG as well since while it's warming up it will not be working as hard to pump thicker oil. I have been using it exclusively now for six years with no problems and my cold starts are smooth as silk.
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Old 01-22-2014, 10:51 AM
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I ran 0w20 in my 2010 Ram in the winters, never had an issue with MDS.
As stated above it helped with cold starts.
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Old 01-22-2014, 05:57 PM
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Its the "20" that RAM says is supposed to be in it for MDS to work correctly. 0W20 or 5W20 won't hurt anything. Use a high quality oil filter and your golden.
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Old 01-22-2014, 06:28 PM
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the ZERO or 5 or any other number for that matter before the W, only has to do with the cold start temperature
The number after the W is all that really matters to the normal operation of the engine

the W actually means Winter Grade

5 Winter Grade-SAE 20 motor oil
0 Winter Grade-SAE 20 motor oil is all that is available in some countries like Australia for a MDS engines

Here is the best way to understand it in layman's terms
http://www.upmpg.com/tech_articles/motoroil_viscosity/

I noticed just recently that Walmart here is now carrying 0w - 20
i buy my motor oil there because it is about $10 cheaper for a 5 quart jug, the auto parts stores sell it for $10 more per jug
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Old 01-23-2014, 10:42 AM
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The pre-W number also indicates how tenacious the oil is in clinging to parts after shut-down. A 5W20 oil will remain on parts (protecting them during storage and during start-up) better than a 0W20 will. IMO

Cold start-ups are so short in duration that the difference between 0W and 5W likely is significant only in February in Siberia. I'm not ready to drive anywhere when it's that cold for 5 or ten minutes anyway because the problem in those temps is not the engine which started.... it's the transmission which is cold.
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