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frontpage Posted by BabyBubba • Mar 14, 2025
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frontpage Posted by BabyBubba • Mar 14, 2025

1-Gallon Mobil Delvac Extreme Heavy Duty Full Synthetic Diesel Engine Oil (15W-40)

$9.75 after $10 Rebate

$20

Walmart
45 Comments 25,750 Views
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Deal Details
Note: We summarize the promotion terms as offered by the provider, but be sure to personally verify all information and requirements before submitting; we are not responsible for ineligible submissions.

Walmart has select Mobil Delvac Extreme Heavy Duty Full Synthetic Diesel Engine Oils (15W-40) on sale from $9.77 after a Mobil Delvac Rebate, see below for details. Shipping is free w/ Walmart+ (free 30-day trial) or on orders of $35+, otherwise select free store pickup where available.

Thanks to Community Member BabyBubba for sharing this deal.
  • Note: Maximum total of up to $100 back per household, please check the rebate form for full terms & details. Rebate is paid our as a Visa Prepaid Card. Pricing and availability for purchase may vary by location.
Available Options:Rebate Notes:
  • Only eligible Customers may receive a rebate.
  • Fully complete the online proof of purchase form at promotion.mobil.com/offers/delvacrebate. Upload an image of your receipt(s) from a participating retailer dated during the Promotion Period with Eligible Product(s) circled. All online submissions must be completed by 11:59:59 p.m. CST, May 7, 2025. You must complete a separate online offer form for each receipt with Eligible Products. Illegible images will not be accepted.
  • For online purchases, upload the invoice and final delivery or pick-up receipt for your qualifying purchase from a participating retailer.

Editor's Notes

Written by SaltyOne | Staff
  • Offer valid for a limited time only / while supplies last.
  • Please see the Rebate Page for full terms & conditions.
Please see the original post for additional details & refer to the comments below for discussion.

Original Post

Written by BabyBubba
Community Notes
About the Poster
Deal Details
Community Notes
About the Poster
Note: We summarize the promotion terms as offered by the provider, but be sure to personally verify all information and requirements before submitting; we are not responsible for ineligible submissions.

Walmart has select Mobil Delvac Extreme Heavy Duty Full Synthetic Diesel Engine Oils (15W-40) on sale from $9.77 after a Mobil Delvac Rebate, see below for details. Shipping is free w/ Walmart+ (free 30-day trial) or on orders of $35+, otherwise select free store pickup where available.

Thanks to Community Member BabyBubba for sharing this deal.
  • Note: Maximum total of up to $100 back per household, please check the rebate form for full terms & details. Rebate is paid our as a Visa Prepaid Card. Pricing and availability for purchase may vary by location.
Available Options:Rebate Notes:
  • Only eligible Customers may receive a rebate.
  • Fully complete the online proof of purchase form at promotion.mobil.com/offers/delvacrebate. Upload an image of your receipt(s) from a participating retailer dated during the Promotion Period with Eligible Product(s) circled. All online submissions must be completed by 11:59:59 p.m. CST, May 7, 2025. You must complete a separate online offer form for each receipt with Eligible Products. Illegible images will not be accepted.
  • For online purchases, upload the invoice and final delivery or pick-up receipt for your qualifying purchase from a participating retailer.

Editor's Notes

Written by SaltyOne | Staff
  • Offer valid for a limited time only / while supplies last.
  • Please see the Rebate Page for full terms & conditions.
Please see the original post for additional details & refer to the comments below for discussion.

Original Post

Written by BabyBubba

Community Voting

Deal Score
+39
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Price Intelligence

Model: Mobil Delvac Extreme Heavy Duty Full Synthetic Diesel Engine Oil 15W-40, 1 gal

Deal History 

Sale Price
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Current Prices

Sort: Lowest to Highest | Last Updated 4/26/2025, 12:10 PM
Sold By Sale Price
Walmart$19.77
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Top Comments

BabyBubba
Lots of people use it in motorcycles and small engines, but the zinc content doesn't go well with gasoline engine catalytic converters, so gas engine automotive use is usually not recommended. There's a lot of information on the net about this.
BabyBubba
The rebate combined will the rollback discounted price is the important part, and i posted the most popular viscosity for reference. Anyone interested can take the 15 seconds to go find the 10W-30 or other viscosity they need after clicking through to Walmart. That takes less time (and is certainly more productive) than commenting that this is not the right viscosity for their application.
BabyBubba
This is top of the line diesel engine oil. Don't put too much faith in retailer vehicle application recommendations; they are wrong on a regular basis. Your owner's manual always has viscosity and grade information for oil selection.

45 Comments

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Mar 15, 2025
193 Posts
Joined May 2019
Mar 15, 2025
AFC118
Mar 15, 2025
193 Posts
Quote from BabyBubba :
Lots of people use it in motorcycles and small engines, but the zinc content doesn't go well with gasoline engine catalytic converters, so gas engine automotive use is usually not recommended. There's a lot of information on the net about this.

Oil shouldn't really be effecting your cats unless I guess you're burning a lot of it…
2
Mar 15, 2025
623 Posts
Joined Jan 2021
Mar 15, 2025
BlownCamaro
Mar 15, 2025
623 Posts
I use this in motorcycles and hot rods. It's GREAT oil!
Original Poster
Pro
Mar 15, 2025
3,570 Posts
Joined Apr 2021
Mar 15, 2025
BabyBubba
Mar 15, 2025
Original Poster
Pro
3,570 Posts
Quote from AFC118 :
Oil shouldn't really be effecting your cats unless I guess you're burning a lot of it…
Agreed. Sorta brought it up as one of the big points against using diesel oil in gas engines. Some slight oil burning is inevitable, even on a new engine. And there are so many premium synthetics made for gas engines; why risk it?
2
1
Mar 15, 2025
1,141 Posts
Joined Aug 2008
Mar 15, 2025
kristofen
Mar 15, 2025
1,141 Posts
Quote from AFC118 :
Oil shouldn't really be effecting your cats unless I guess you're burning a lot of it…
For a lot of cars, a qt/1k MI is "within spec". Definitely enough to clog your cats
2
Pro
Mar 15, 2025
2,780 Posts
Joined Jun 2017
Mar 15, 2025
NikonShr
Pro
Mar 15, 2025
2,780 Posts
Can't beat it...all my rides use it!
1
Mar 15, 2025
1,255 Posts
Joined Jan 2010
Mar 15, 2025
Tsumi
Mar 15, 2025
1,255 Posts
I just bought a bunch of Rotella T6 from Walmart too.... well, it can't hurt to stock up.
Original Poster
Pro
Mar 15, 2025
3,570 Posts
Joined Apr 2021
Mar 15, 2025
BabyBubba
Mar 15, 2025
Original Poster
Pro
3,570 Posts
Quote from Tsumi :
I just bought a bunch of Rotella T6 from Walmart too.... well, it can't hurt to stock up.
Between Shell, Mobil, and other brands, these big rebates become available at least 2-3 times a year. Stocking up with rebates is a great way to always have premium oil on hand for cheap, especially on one like this where 10 gallons are available. I try to rotate stock and to not store new oil for more than a year or so in climate controlled storage. In the past I've had some Mobil 1 discolor with an orange tinge after a year plus in shop storage without climate control.
1

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Mar 15, 2025
352 Posts
Joined Nov 2017
Mar 15, 2025
EzC4765
Mar 15, 2025
352 Posts
but, but, but, you didn't list my viscosity and ensure that it works in my vehicle without ever having met me or know what I drive. They should kick you off of the site, unless you tell me how to change my oil.
1
Original Poster
Pro
Mar 15, 2025
3,570 Posts
Joined Apr 2021
Mar 15, 2025
BabyBubba
Mar 15, 2025
Original Poster
Pro
3,570 Posts
Quote from EzC4765 :
but, but, but, you didn't list my viscosity and ensure that it works in my vehicle without ever having met me or know what I drive. They should kick you off of the site, unless you tell me how to change my oil.
Hahahaha! ! I've been (sort of) flirting with getting kicked off the site for some time now (Actually the mods are pretty chill and patient with me and in return I try to keep it between the ditches). But I have this dogged determination to help people save money...call it a character flaw. It's just the right thing to do, especially in these wildly inflationary times. Your comment happened to coincide with a YT video that hit my feed for the first time this morning.

https://www.youtube.com/watch?v=LqelpONZvpw
Mar 15, 2025
309 Posts
Joined Apr 2016
Mar 15, 2025
fantastic84
Mar 15, 2025
309 Posts
Quote from brotherhpj41 :
If my research is correct this oil is not on Fords approved list because the oil is high in zinc which might not work well with the oil cooler
FYI: Ford wants 1000 PPM Phosphorus minimum to meet their F1 specification. This oil DOES meet Fords F1 approval.
Mar 15, 2025
530 Posts
Joined Nov 2023
Mar 15, 2025
IdahoRoamingGnome
Mar 15, 2025
530 Posts
Quote from kristofen :
For a lot of cars, a qt/1k MI is "within spec". Definitely enough to clog your cats

My Subaru 3.6R at 90k started burning 1qt/3k miles, so ima stick to the normal 5-30w Kirkland oil.
Mar 16, 2025
352 Posts
Joined Nov 2017
Mar 16, 2025
EzC4765
Mar 16, 2025
352 Posts
Quote from BabyBubba :
Hahahaha! ! I've been (sort of) flirting with getting kicked off the site for some time now (Actually the mods are pretty chill and patient with me and in return I try to keep it between the ditches). But I have this dogged determination to help people save money...call it a character flaw. It's just the right thing to do, especially in these wildly inflationary times. Your comment happened to coincide with a YT video that hit my feed for the first time this morning.

https://www.youtube.com/watch?v=LqelpONZvpw
Not going to say that I watched that whole video but her point about stupidity vs ignorance and the lack of critical thinking are spot on.

I am of the opinion that the onset of emotional intelligence was the sign that our society was in full retrograde. It isn't like logic and reason failed society.
Mar 17, 2025
391 Posts
Joined Mar 2006
Mar 17, 2025
sobitthen
Mar 17, 2025
391 Posts
A deal on an oil I use all the time, in fact I bought a jug in the rebate period, just the rebate link goes to a page where you need to log in, but no ability to create an account. So unless a link to an actual rebate form, or some way to file the rebate, the deal is no good to me other than the $19.95 price, that is decent for an oil I put in all my motorcycles and ATVs here, and trucks etc.. I like diesel oil and so far no issue with my converters I am aware of... he oil is for the internals of the engine, not for combustion, so if you are consuming oil, you have more problems than just the zinc levels of the oil with your converters.. the zinc protects the metal on metal wear, bottoms of your lifters on that cam for example,,,
Mar 19, 2025
71 Posts
Joined Dec 2022
Mar 19, 2025
MellowRecess8806
Mar 19, 2025
71 Posts
Quote from AFC118 :
That is in fact what it says.

Mobil has another oil " Mobil Diesel Truck" it's pricier but supposed to be better.

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Mar 20, 2025
348 Posts
Joined Apr 2009
Mar 20, 2025
intex45
Mar 20, 2025
348 Posts
wondering if this is "BMW certified" for my X5 diesel. The manual strictly says LL-12 or better.

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