Using 5W-40 Synthetic oil in Hot Weather - Dodge Cummins Diesel Forum
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post #1 of 43 (permalink) Old 06-03-2019, 09:29 PM Thread Starter
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Using 5W-40 Synthetic oil in Hot Weather

After 6 months, I took my 2018 Ram 2500 diesel to the dealership for its first free oil/filter change. Per the manual, I requested 15W-40 for the hot Texas summer. I also requested full synthetic. When the oil/filter change was completed, the adviser commented that full synthetic was used. I clarified that it was 15W-40 synthetic. He replied that they “put 5W-40 in since a full synthetic 15W-40 isn’t available”. After I got home, a quick check on the internet proved him wrong.

My question to this group is: Will using the lighter weight in 100 degree temperatures damage my engine?

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post #2 of 43 (permalink) Old 06-03-2019, 09:41 PM
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Perfectly fine running 5-40

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post #3 of 43 (permalink) Old 06-03-2019, 09:44 PM
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In summer heat, they are both the same weight, 40. The 5W and 15W are winter weights, thus the W.
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post #4 of 43 (permalink) Old 06-03-2019, 10:07 PM
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15/40 t6 literally became available less than 10 days ago. Don’t expect the fca dealers to get it for at least 6 months. Fluids are never updated in parts catalogs as timely as one would expect. Sorry. However 5/40 is just the same in the above 0 degree environment.
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post #5 of 43 (permalink) Old 06-03-2019, 10:58 PM
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The first number has no meaning for what you are asking. Look up the product data sheets for those oils. Look at the kv at 100 celcius. That number is what you want. It's the kinematic viscosity at 100c. That's what dictates if the oil is a 40 weight or not. Both 15w40 and 5w40 will have to fall in the same viscosity bracket in order to be a 40.
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post #6 of 43 (permalink) Old 06-04-2019, 09:23 AM
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So the question should be:
Will a 5W oil be too light for the Hot Texas Winters?


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post #7 of 43 (permalink) Old 06-04-2019, 09:53 AM
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The line is most newer diesels recommend 5-40 I've personally run 5-40 in my 13 with over 550,000 miles never used drop of oil till I traded. My 18 same 180,000 and yes I pull in heat of summer Texas, California pulling.

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post #8 of 43 (permalink) Old 06-04-2019, 09:55 AM
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Quote:
Originally Posted by brulaz View Post
So the question should be:
Will a 5W oil be too light for the Hot Texas Winters?
5w is for cold starts, 30* or 0*, the viscosity of the oil will be able to circulate thru the engine at low temps. The 40 says that the oil will hold up at higher temperatures (2??*).

To answer your question. 5w-40 will be fine in our engines all year round in ANY state in the US.
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post #9 of 43 (permalink) Old 06-04-2019, 10:59 AM
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i only use full synthetic 5w40 as well wouldnt sweat it
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post #10 of 43 (permalink) Old 06-04-2019, 07:29 PM
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Thats what I have run here in TX as well T6 5-40...I looked for 15-40 T6 forever since I ran 15-40 rotella in my 5.9. Like others have said you have to have EXTREME temps (hot or cold) to really justify needing it


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post #11 of 43 (permalink) Old 06-04-2019, 08:40 PM
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You know, in the OWNER'S MANUAL, (y'all have heard of those, RIGHT???) it clearly states the temperature ranges for the various oil viscosity ratings.
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post #12 of 43 (permalink) Old 06-04-2019, 10:30 PM
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Quote:
Originally Posted by Ltngdrvr View Post
You know, in the OWNER'S MANUAL, (y'all have heard of those, RIGHT???) it clearly states the temperature ranges for the various oil viscosity ratings.
You mean like in this 2019 oil discussion thread here >> https://www.cumminsforum.com/forum/2...l#post28995191
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