Benefits of Thinner Oil - Dodge Challenger Forum: Challenger & SRT8 Forums
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post #1 of 38 (permalink) Old 03-31-2014, 08:21 AM Thread Starter
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Benefits of Thinner Oil

I always use the recommended Mobil 0W-40 synthetic oil in my SRT.

I found an interesting study of the advantages of using thinner weight oil. Here is what was said:


Thinner oil flows quicker at cold start-up to begin lubricating critical engine components much more quickly than thicker oil can. Most engine wear takes place during cold start-up before oil flow can reach all the components. So, quicker flowing thinner oil will help reduce start-up engine wear, which is actually reducing wear overall.
  • The more free flowing thinner oil at cold start-up, is also much less likely to cause the oil filter bypass to open up, compared to thicker oil. Of course if the bypass opened up, that would allow unfiltered oil to be pumped through the engine. The colder the ambient temperature, and the more rpm used when the engine is cold, the more important this becomes.
  • Thinner oil also flows more at normal operating temperatures. And oil FLOW is lubrication, but oil pressure is NOT lubrication. Oil pressure is only a measurement of resistance to flow. Running thicker oil just to up the oil pressure is the wrong thing to do, because that only reduces oil flow/lubrication. Oil pressure in and of itself, is NOT what we are after.
  • The more free flowing thinner oil will also drain back to the oil pan quicker than thicker oil. So, thinner oil can help maintain a higher oil level in the oil pan during operation, which keeps the oil pump pickup from possibly sucking air during braking and cornering.


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post #2 of 38 (permalink) Old 03-31-2014, 08:29 AM
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Quote:
Originally Posted by Cuda340 View Post
I always use the recommended Mobil 0W-40 synthetic oil in my SRT.

I found an interesting study of the advantages of using thinner weight oil. Here is what was said:


Thinner oil flows quicker at cold start-up to begin lubricating critical engine components much more quickly than thicker oil can. Most engine wear takes place during cold start-up before oil flow can reach all the components. So, quicker flowing thinner oil will help reduce start-up engine wear, which is actually reducing wear overall.
  • The more free flowing thinner oil at cold start-up, is also much less likely to cause the oil filter bypass to open up, compared to thicker oil. Of course if the bypass opened up, that would allow unfiltered oil to be pumped through the engine. The colder the ambient temperature, and the more rpm used when the engine is cold, the more important this becomes.
  • Thinner oil also flows more at normal operating temperatures. And oil FLOW is lubrication, but oil pressure is NOT lubrication. Oil pressure is only a measurement of resistance to flow. Running thicker oil just to up the oil pressure is the wrong thing to do, because that only reduces oil flow/lubrication. Oil pressure in and of itself, is NOT what we are after.
  • The more free flowing thinner oil will also drain back to the oil pan quicker than thicker oil. So, thinner oil can help maintain a higher oil level in the oil pan during operation, which keeps the oil pump pickup from possibly sucking air during braking and cornering.
*nice write up!!

Has engine wear increases over time so should engine oil weight... True Fact!!!!

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Last edited by salvy59; 03-31-2014 at 08:31 AM.
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post #3 of 38 (permalink) Old 03-31-2014, 08:35 AM
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Good read, thanks Cuda
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post #4 of 38 (permalink) Old 03-31-2014, 10:46 AM
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That makes sense. And makes me feel better about running the OEM suggested 5-20 in my R/T.


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post #5 of 38 (permalink) Old 03-31-2014, 11:11 AM
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thinner oil and less oil = more power.

anyone watch NHRA Stock class racing? not uncommon to see some guys drain a quart or so before the finals
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post #6 of 38 (permalink) Old 03-31-2014, 06:24 PM
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Quote:
Originally Posted by Cuda340 View Post
I always use the recommended Mobil 0W-40 synthetic oil in my SRT.

I found an interesting study of the advantages of using thinner weight oil. Here is what was said:


Thinner oil flows quicker at cold start-up to begin lubricating critical engine components much more quickly than thicker oil can. Most engine wear takes place during cold start-up before oil flow can reach all the components. So, quicker flowing thinner oil will help reduce start-up engine wear, which is actually reducing wear overall.
  • The more free flowing thinner oil at cold start-up, is also much less likely to cause the oil filter bypass to open up, compared to thicker oil. Of course if the bypass opened up, that would allow unfiltered oil to be pumped through the engine. The colder the ambient temperature, and the more rpm used when the engine is cold, the more important this becomes.
  • Thinner oil also flows more at normal operating temperatures. And oil FLOW is lubrication, but oil pressure is NOT lubrication. Oil pressure is only a measurement of resistance to flow. Running thicker oil just to up the oil pressure is the wrong thing to do, because that only reduces oil flow/lubrication. Oil pressure in and of itself, is NOT what we are after.
  • The more free flowing thinner oil will also drain back to the oil pan quicker than thicker oil. So, thinner oil can help maintain a higher oil level in the oil pan during operation, which keeps the oil pump pickup from possibly sucking air during braking and cornering.
Maybe olive oil would be better for all cars no matter what engine your running. Its a lot thinner and so would flow like hell.
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post #7 of 38 (permalink) Old 03-31-2014, 06:39 PM
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Summer time hot weather climates- weight of my oil goes up no cold starts. lol

As engine wear increases, weight of oil goes up. lol No doubt!!!
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post #8 of 38 (permalink) Old 12-14-2018, 11:25 PM
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Ha... thought I'd resurrect this old thread just for fun

I always thought that 0W-40 was actually 40 weight oil fortified to act like 0 weight when it gets cold. However, I was wrong.

It's actually 0 weight oil fortified to act like 40 weight when it gets hot. May not sound like much of a difference, but if ya think about it, it makes sense. Good to know what you're running.

That's part of the reason when 0W-40 gets old and tired, it can't "act" like 40 weight any more. The VII molecules that make it "act" thicker when it gets hot... wear out over time.

The way VI Improvers (VII's) work is that the huge molecules tend to coil up into balls when cold, thus having limited effect on the oil’s flow (viscosity). When hot, however, the molecules uncoil and stretch out, thus causing an increase in viscosity. The thin oil ACTS thicker when it gets hot.

Last edited by garyahouse; 12-14-2018 at 11:38 PM.
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post #9 of 38 (permalink) Old 12-15-2018, 10:32 AM
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Quote:
Originally Posted by salvy59 View Post
*nice write up!!

Has engine wear increases over time so should engine oil weight... True Fact!!!!

Only if oil pressure drops below some acceptable threshold. Maybe.



Really though if the engine has suffered enough wear -- mostly in the main/rod bearings areas -- to cause a fall in oil pressure heavier oil isn't the answer. An engine refresh is the answer.


BTW, I put 317K miles on a car and its engine and the engine was just as happy with 0w-40 oil at 300K+ miles as it was at 0K miles. Another car I ran it up to 161K miles and hot oil pressure was unchanged from when I bought the car -- used -- with <10K miles on it to when it has 161K miles on it. A number of other cars I put close to 150K miles on the engine and never had to deviate from the factory recommended oil. The engines never developed/manifested any indication the oil recommended by the factory was in any way insufficient to the task.


Oil consumption remained nearly constant as well.



There is really minimal wear with proper oil selection and servicing. The offering of "high mileage" oils by oil companies is just marketing.
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post #10 of 38 (permalink) Old 01-02-2019, 12:46 PM
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I read that also and it make sense.

Let me ask this question. True, 0 will flow faster, better, at cold start.

I also read (somewhere) that 0 does not offer the same "protection" as 5.

(3.6 V6 uses 5-20.)

So faster flow is better protection, but the oil at that time, before it's fully heated up, may not be thick enough to protect.

That's a good point too.

What do you guys think?

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