Shell Rotella T6 15w40 - Ford Powerstroke Diesel Forum
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post #1 of 23 Old 07-18-2019, 09:18 AM Thread Starter
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Shell Rotella T6 15w40

I had read on here not to long ago about this new oil weight in 15w40. Iím still using the tried n true T4 15w40 but for the upcoming winter where Iíll be traveling to colder climates often Iím interested in switching to either the T5 or the new T6 in 15w40. I see the T6 in 15w40 on amazon but where have you guys found it locally? I donít see it listed on Walmart website either. Iím not adding up the mileage a lot, maybe 5k annually.
Just looking to hear what anyone has experienced lately with that new weight oil and if itís worth it to buy over the T5 even though the T6 seems to be more then double the price over T5 on Amazon.
Thanks.


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post #2 of 23 Old 07-18-2019, 10:35 AM
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Originally Posted by Billy231 View Post
I had read on here not to long ago about this new oil weight in 15w40. I’m still using the tried n true T4 15w40 but for the upcoming winter where I’ll be traveling to colder climates often I’m interested in switching to either the T5 or the new T6 in 15w40. I see the T6 in 15w40 on amazon but where have you guys found it locally? I don’t see it listed on Walmart website either. I’m not adding up the mileage a lot, maybe 5k annually.
Just looking to hear what anyone has experienced lately with that new weight oil and if it’s worth it to buy over the T5 even though the T6 seems to be more then double the price over T5 on Amazon.
Thanks.


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As I understand it, the 5W vs 15W has to do with the viscosity at low temp, and the 40 is the viscosity at high temp.

I would run the spec your truck requires, so if you're in the 7.3 forum, I would be using the 15w30 - unless you have some cold start issues, then the 5W40 may benefit you during the cold conditions.

As far as the T5 blend or T6 synthetic, run what your wallet can hold

I drive a Powerstroke, its not stock.
I put hard earned money into it
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post #3 of 23 Old 07-18-2019, 10:46 AM
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Can't give you a personal comparison going from dino because I've always run T6. However, there is plenty of info on it out there.

I was able to find T6 15w at my local walmart for $20/gal. It was not on their website at the time of purchase. Switched from T6 5w which I was also very happy with

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post #4 of 23 Old 07-18-2019, 11:11 AM
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Rural Kings around me carry the 15w T6 now. So that may be an option.
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post #5 of 23 Old 07-18-2019, 11:29 AM Thread Starter
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Thanks guys, thereís no rural king stores anywhere near NY.
Iíll try Wally World and see what they have on shelf if anything Iíll try the T5 15w40. Thatís still better then the T4 for winter time.


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post #6 of 23 Old 07-18-2019, 11:33 AM
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Quote:
Originally Posted by Billy231 View Post
I had read on here not to long ago about this new oil weight in 15w40. Iím still using the tried n true T4 15w40 but for the upcoming winter where Iíll be traveling to colder climates often Iím interested in switching to either the T5 or the new T6 in 15w40. I see the T6 in 15w40 on amazon but where have you guys found it locally? I donít see it listed on Walmart website either. Iím not adding up the mileage a lot, maybe 5k annually.
Just looking to hear what anyone has experienced lately with that new weight oil and if itís worth it to buy over the T5 even though the T6 seems to be more then double the price over T5 on Amazon.
Thanks.


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I have been an avid user of conventional 15w-40 my whole life UNTIL LAST YEAR. I tried a full synthetic 5w-40 for winter and WOW. truck ran so smooth, warmed up quicker, sounded so much better in -25 etc. The only downfall was I burned more of it. some truck don't some do and mine ate it quickly compared to regular 15w-40. I now use the new t6 15w-40 full synthetic. Seems to work just as good and I don't burn nearly as much. I cannot find it anywhere online except walmart.com and advance auto (pricey there). so buy it locally if you can.

However even the rotella t5 15w-40 synthetic blend will run noticeably smoother in winter compared to regular 15w-40. My truck whined and groaned until it warmed up at -25. Check rotellas rebates. You can usually get $7 off a gallon for the t6 5w-40 and 15w-40.


Use t5 or t6 and you will hear/feel a difference. Im not gonn argue whether its worth the extra money with anyone but for me its been worth it every penny more.
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post #7 of 23 Old 07-18-2019, 11:33 AM
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Originally Posted by DesertDiesel View Post
Can't give you a personal comparison going from dino because I've always run T6. However, there is plenty of info on it out there.

I was able to find T6 15w at my local walmart for $20/gal. It was not on their website at the time of purchase. Switched from T6 5w which I was also very happy with
Seems like a goof up on their part, I can barely find a 3 pack for under $100

I drive a Powerstroke, its not stock.
I put hard earned money into it
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post #8 of 23 Old 07-18-2019, 11:38 AM Thread Starter
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I should have specified itís a 99 7.3
I think I read that info here previously which I couldnít locate today that guys were using this T6 15w40 for the 7.3


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post #9 of 23 Old 07-18-2019, 12:44 PM
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I should have specified itís a 99 7.3
I think I read that info here previously which I couldnít locate today that guys were using this T6 15w40 for the 7.3


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Im using Rotella t6 15W-40 full synthetic in my 1999 7.3l. The t6 5w-40 was great but I burned too much of it between changes. You will like the 15w-40 full synthetic or the t5 synthetic blend especially in cold weather. there is ABSOLUTLEY NOTHING wrong with conventional 15w-40 but for a few bucks more the synthetic blends and full synthetics just let the truck operate better in cold weather. Its the only reason I switched and it was the first time I've ever used anything other than conventional oil.
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post #10 of 23 Old 07-18-2019, 07:14 PM Thread Starter
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Thanks Justin and others, I was wondering what other have been experiencing in cold winter months and I appreciate the comments along with each application and Iíll try and locate the T6 in 15w40 and can run it year round.


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