Another Oil Question? - Dodge Cummins Diesel Forum
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post #1 of 54 (permalink) Old 02-08-2020, 08:58 AM Thread Starter
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Another Oil Question?

OK, being an old retiree and not much to do except read too much into things, I have tried to understand what would be the best viscosity Synthetic oil to use in my truck. I know what the owner’s manual says, and I live in FL. So, I have been using 15W-40 (T4, T5). The last couple oil changes I used, 5W40 (T6, and then Valvoline). I really liked the Valvoline Extreme the best as the engine ran so smooth with good mileage. Amazon has it for sale at $59.70 for case of 3. I see now that the Shell T6 comes in 15W-40 at $89.64 for case of 3. So, my recent oil change, I went with T6 15W-40. The reason I used it was that when I ordered the Valvoline 5W-40, it go returned to Amazon undeliverable for whatever reason, so I reordered the T6 to try. It seems to run good, but I still like the Valvoline better. Now, my question is, why does Shell have the 15W-40 and Valvoline doesn’t. I tried to read about all these Viscosity Index Improvers, to the point of my old brain exploding. The only thing I got out of all this is that it does seem to take a lot of Viscosity Improvers to get the oil from 5W to 40 when hot. I’m not sure that much improvers will actually hold up good enough to really keep the oil at 40 when hot for the duration of the oil change. Seems that the less Improvers needed, as in 15W-40, would be better in keeping the range required. Am I reading too much into this?


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post #2 of 54 (permalink) Old 02-08-2020, 10:48 AM
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Yes, you are reading too much into it. That's OK though as we all do that from time to time. If you like the Valvoline then run it and find something new to stress over, like grid heater bolts or turbo actuators. Those seem to be popular things to worry about these days.
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post #3 of 54 (permalink) Old 02-08-2020, 10:56 AM
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Well put. From the both of you.

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post #4 of 54 (permalink) Old 02-08-2020, 11:02 AM
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Don't forget about Walmart delivery...I got Shell T6, 15w40 to the door for ~$60. Much better price than Amazon.

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post #5 of 54 (permalink) Old 02-08-2020, 11:25 AM
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Any of those oils and grades will work fine for you. I get T6 Rotella on sale because with mail in rebates that they usually offer it ends up being the cheapest synthetic I can get. I get synthetic as I need 5w40 for cold weather.

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post #6 of 54 (permalink) Old 02-08-2020, 12:05 PM
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We have a few stores that put Valvoline Premium Blue 15/40 on sale now & then for $10.99-$11.99 a gallon. I usually get 9 gallons when on sale. Then hopefully it's on sale again when I get down to the last 3 gallons.

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post #7 of 54 (permalink) Old 02-08-2020, 01:25 PM Thread Starter
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Quote:
Originally Posted by Wyo George View Post
Yes, you are reading too much into it. That's OK though as we all do that from time to time. If you like the Valvoline then run it and find something new to stress over, like grid heater bolts or turbo actuators. Those seem to be popular things to worry about these days.
I worry about those too. You're right though, I'm surprised I lasted this long worrying about everything.
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post #8 of 54 (permalink) Old 02-08-2020, 01:33 PM
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Quote:
Originally Posted by tkd01 View Post
OK, being an old retiree and not much to do except read too much into things, I have tried to understand what would be the best viscosity Synthetic oil to use in my truck. I know what the owner’s manual says, and I live in FL. So, I have been using 15W-40 (T4, T5). The last couple oil changes I used, 5W40 (T6, and then Valvoline). I really liked the Valvoline Extreme the best as the engine ran so smooth with good mileage. Amazon has it for sale at $59.70 for case of 3. I see now that the Shell T6 comes in 15W-40 at $89.64 for case of 3. So, my recent oil change, I went with T6 15W-40. The reason I used it was that when I ordered the Valvoline 5W-40, it go returned to Amazon undeliverable for whatever reason, so I reordered the T6 to try. It seems to run good, but I still like the Valvoline better. Now, my question is, why does Shell have the 15W-40 and Valvoline doesn’t. I tried to read about all these Viscosity Index Improvers, to the point of my old brain exploding. The only thing I got out of all this is that it does seem to take a lot of Viscosity Improvers to get the oil from 5W to 40 when hot. I’m not sure that much improvers will actually hold up good enough to really keep the oil at 40 when hot for the duration of the oil change. Seems that the less Improvers needed, as in 15W-40, would be better in keeping the range required. Am I reading too much into this?
You are too worried, like Wyo said, there are other things on these trucks to worry about.............NOT. I'll bet you this, if I change your oil, and you drive it, you can not tell me what oil I installed. Any oil that is correct for the engine will "feel" the same.
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post #9 of 54 (permalink) Old 02-08-2020, 01:48 PM
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Quote:
Originally Posted by tkd01 View Post
OK, being an old retiree and not much to do except read too much into things, I have tried to understand what would be the best viscosity Synthetic oil to use in my truck. I know what the owner’s manual says, and I live in FL. So, I have been using 15W-40 (T4, T5). The last couple oil changes I used, 5W40 (T6, and then Valvoline). I really liked the Valvoline Extreme the best as the engine ran so smooth with good mileage. Amazon has it for sale at $59.70 for case of 3. I see now that the Shell T6 comes in 15W-40 at $89.64 for case of 3. So, my recent oil change, I went with T6 15W-40. The reason I used it was that when I ordered the Valvoline 5W-40, it go returned to Amazon undeliverable for whatever reason, so I reordered the T6 to try. It seems to run good, but I still like the Valvoline better. Now, my question is, why does Shell have the 15W-40 and Valvoline doesn’t. I tried to read about all these Viscosity Index Improvers, to the point of my old brain exploding. The only thing I got out of all this is that it does seem to take a lot of Viscosity Improvers to get the oil from 5W to 40 when hot. I’m not sure that much improvers will actually hold up good enough to really keep the oil at 40 when hot for the duration of the oil change. Seems that the less Improvers needed, as in 15W-40, would be better in keeping the range required. Am I reading too much into this?
Don't get too wrapped up in all that VII talk. If you really want to get into it, try Bob Is The Oil Guy. Those guys are serious. About what, I'm not sure

https://www.bobistheoilguy.com/forums/ubbthreads.php

5W-40 synthetic is virtually always superior to any 15W-40 non synthetic. Period. Doesn't mean the 15W-40 is bad, it's just that the synthetic is better.

Maybe a 15W-40 is more gooder if your engine is about to rattle itself to death and you just want to keep it alive for another few months... It's also cheaper, if that's important to you. To some people, it is. Those that change their oil every other month and don't do it themselves, the costs can add up.

But if you're doing it yourself and/or the only difference in cost is the extra $10-$20 for the oil once or twice a year, it's a no-brainer. 5W-40 Synthetic all the way.

Oh yeah, the Amazon guy dropped my oil in the back of his truck and splattered it all over the place. So mine had to be re-ordered, too.

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post #10 of 54 (permalink) Old 02-08-2020, 02:57 PM
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Stick with 15w40 conventional. It will work absolutely fine in your climate. It's cheap as well.

Synthetic is great but conventional has come so far, base oil is a non issue.

I think it was valvoline that did some wear testing. The lower the spread between the W and viscosity at 100C the better wear protection. 15w40 does better than 5w40, which is better than 0w40.

Obviously cold climate dictates your W.

Viscosity is another story. 30 weights are fine, as are 40 weights. Cummins even states this.

Run a 15w40, 5w40 or even a 10w30. If its CES20081/86 it's fine. No one will care, not even your engine.
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post #11 of 54 (permalink) Old 02-08-2020, 03:38 PM
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Pick one from the linked list:
https://www.google.com/url?q=https:/...wF4ADEmEoAGRfc

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post #12 of 54 (permalink) Old 02-09-2020, 07:29 PM
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Quote:
Originally Posted by 7492 View Post
You are too worried, like Wyo said, there are other things on these trucks to worry about.............NOT. I'll bet you this, if I change your oil, and you drive it, you can not tell me what oil I installed. Any oil that is correct for the engine will "feel" the same.
To the OP-Your truck does not know what oil you put in it. It doesn't run smoother with one oil or another and I can assure you the mpg is the same.
It's all in your head. Just buy whatever is cheapest and locally available of the correct viscosity. No need to spend the extra $$ on synthetic oil. Change your oil and filter at the specified intervals and you will have nothing to worry about.

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