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frontpagemg3 posted Apr 06, 2026 10:31 AM
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frontpagemg3 posted Apr 06, 2026 10:31 AM

Costco Members: 4-Pk 5-Qt Kirkland Signature Full Synthetic Motor Oil (various)

+ Free S&H

$54 each

$70

Costco Wholesale
294 Comments 85,445 Views
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Deal Details
Costco Wholesale has for its Members: 4-Pack 5-Quart Kirkland Signature Full Synthetic Motor Oil (various) for $53.99 each. Shipping is free.

Thanks to community member mg3 for sharing this deal.

Note: Non-Members may purchase but are subject to a 5% surcharge

Available:

Editor's Notes

Written by qwikwit | Staff
  • The sale is valid 4/6/26 through 5/3/26. While supplies last. Limit 5 per member.
  • This offer matches the previous and popular Frontpage Deal from August 2025, which received +203 community votes.
  • If you don't have a Costco Warehouse Membership, you can sign-up here

Original Post

Written by mg3
Community Notes
About the Poster
Deal Details
Community Notes
About the Poster
Costco Wholesale has for its Members: 4-Pack 5-Quart Kirkland Signature Full Synthetic Motor Oil (various) for $53.99 each. Shipping is free.

Thanks to community member mg3 for sharing this deal.

Note: Non-Members may purchase but are subject to a 5% surcharge

Available:

Editor's Notes

Written by qwikwit | Staff
  • The sale is valid 4/6/26 through 5/3/26. While supplies last. Limit 5 per member.
  • This offer matches the previous and popular Frontpage Deal from August 2025, which received +203 community votes.
  • If you don't have a Costco Warehouse Membership, you can sign-up here

Original Post

Written by mg3

Community Voting

Deal Score
+304
Good Deal
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Top Comments

hmrambling
3593 Posts
2593 Reputation
Click on the warehouse on the bottom of your app. Then click that you want to shop your warehouse.

I'm able to easily see that my warehouse doesn't carry most weights and that I'd need to order it online.
mg3
535 Posts
346 Reputation
It's warren oil, the same people who make supertech. I'm thinking if you are changing every 5000 miles (especially given that it's so cheap to do so with this), it'll be no issues. But obviously, ymmv
Janerl
571 Posts
513 Reputation
Interestingly, from I can see, it's $30 for 2x 5qt in-store so online is actually cheaper. I really like that the Costco app lets you check in-store inventory and prices now.

294 Comments

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Apr 06, 2026 02:59 PM
842 Posts
Joined Apr 2008
c3688tApr 06, 2026 02:59 PM
842 Posts
I didn't know that the 5w30 High Mileage version wouldn't have the DexOS badge. Would it be bad to put the non-DexOS high mileage version in my wife's 2019 GM with LGX 3.6L V6 with 125k miles?
Apr 06, 2026 03:00 PM
531 Posts
Joined Feb 2011
newell74Apr 06, 2026 03:00 PM
531 Posts
Quote from DQue :
5w-30 or 10w-30 both work fine for lawn mowers, generators, power washers! These are synthetic oils, unlike those "cheap" 2-cycle engine oils.
Why would someone use 2-stroke oil in a lawnmower, generator, or power washer? Those are all 4-stroke engines and don't premix gas and oil.
Apr 06, 2026 03:02 PM
537 Posts
Joined Jun 2011

This comment has been rated as unhelpful by Slickdeals users.

Apr 06, 2026 03:04 PM
3,608 Posts
Joined Dec 2008
clinteastwoodApr 06, 2026 03:04 PM
3,608 Posts
Quote from c3688t :
I didn't know that the 5w30 High Mileage version wouldn't have the DexOS badge. Would it be bad to put the non-DexOS high mileage version in my wife's 2019 GM with LGX 3.6L V6 with 125k miles?
Does it match the grade your GM requires? Is DexOS one of them or not? My toyota needs 0W-20 in API SN or higher. The 0W-20 they sell has ANI SP, so it works with my Toyota. Check what your car requires.
Apr 06, 2026 03:05 PM
3,608 Posts
Joined Dec 2008
clinteastwoodApr 06, 2026 03:05 PM
3,608 Posts
Quote from robvas :
Black after 1000 miles? What's wrong with your car, or is it a diesel?
Many GDI vehicles look dark fast. Oil color alone is really not an indicator that the oil has degraded or not.
Apr 06, 2026 03:08 PM
54 Posts
Joined Oct 2022
Blue-Light-SpecialApr 06, 2026 03:08 PM
54 Posts
It's strange to me that a lot of peeps buy synthetic for more money and still change at 5k. Why pay for the synthetic if your changing at that interval seems like a waste of money to me. I'm at 10k each change VW turbo vehicle is 10 years old now no issues. And I short trip the crap out of it. 😜😜.
Last edited by Blue-Light-Special April 6, 2026 at 08:37 AM.
5
Apr 06, 2026 03:13 PM
2,982 Posts
Joined May 2018
TimlessApr 06, 2026 03:13 PM
2,982 Posts
Quote from asuka :
API SP. Good if you have an older car that lacks a turbo or timing chain.

Everyone with turbos or timing chains should switch to an API SQ oil, if you want to improve your chances of hitting 300,000 miles.

SQ has added detergents and purity that protects both components specifically. GM is using it to get their way out of the L87 camshaft failure debacle.
Link to the updated specs? And which GM is requiring SQ?

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Apr 06, 2026 03:14 PM
2,006 Posts
Joined Nov 2010
testshootApr 06, 2026 03:14 PM
2,006 Posts
Quote from Irons82 :
Color of the oil is not a reliable indicator of wear. It'll look black after 1000 miles. The only way to know for sure is to send a sample to the lab. Chances are, if you use full synthetic oil, it's fine for 10-15K miles.
I have a F350 with a gas 6.2l I bought used. Did my first 5k oil change and the oil looked the same coming out as it did going in and it has 145k miles on it.
2
2
Apr 06, 2026 03:14 PM
2,982 Posts
Joined May 2018
TimlessApr 06, 2026 03:14 PM
2,982 Posts
Quote from robvas :
Black after 1000 miles? What's wrong with your car, or is it a diesel?
Also, not all the oil is changed.
Apr 06, 2026 03:23 PM
11,761 Posts
Joined Feb 2012

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Apr 06, 2026 03:27 PM
33 Posts
Joined Oct 2004
abovedagameApr 06, 2026 03:27 PM
33 Posts
Quote from nottrollin :
It's $20 for an oil change. Why would anyone even risk going to 10K miles? Change it early and change it often to keep the sludge from building up.
Eh, in that huge engine he probably has a sump capacity of like 8 quarts that he can comfortably push out in terms of mileage.
Apr 06, 2026 03:27 PM
3,572 Posts
Joined Apr 2010
bonbon525Apr 06, 2026 03:27 PM
3,572 Posts
Quote from fthnm2005 :
I wonder if in store is even cheaper?
From my past experience, the price online is cheaper/same than in store, specifically for oil.
Apr 06, 2026 03:30 PM
5,319 Posts
Joined Jul 2006
shahhereApr 06, 2026 03:30 PM
5,319 Posts

Our community has rated this post as helpful. If you agree, why not thank shahhere

Quote from nottrollin :
It's $20 for an oil change. Why would anyone even risk going to 10K miles? Change it early and change it often to keep the sludge from building up.

Ahh, there is a practical balance to this; just because we used to hear 3000 miles does not mean anything today. Saying Change it often only because its $20 also is pointless and the counter is then why not change at 1000 or even 500 miles?????


If the oil is doing what its designed for going to 10,000 miles should be fine. One way to to be certain is if you drive "normal" if not then change sooner 7,500 is a sweet spot. It still costs time and effort to change oil BTW. One Certain way to be sure is to get a used oil analysis (Blackstone) for under $40 to be Sure.


I used to do 5000 OCIs and have gone up to 7500 and even tested at 10,000 and the testing came back indicating that the oil was still with spec to go longer. The only variable is driving conditions heat/cold along with your oil filter and time.


Shahhere
2
Apr 06, 2026 03:31 PM
33 Posts
Joined Oct 2004
abovedagameApr 06, 2026 03:31 PM
33 Posts

Our community has rated this post as helpful. If you agree, why not thank abovedagame

Quote from c3688t :
I didn't know that the 5w30 High Mileage version wouldn't have the DexOS badge. Would it be bad to put the non-DexOS high mileage version in my wife's 2019 GM with LGX 3.6L V6 with 125k miles?
If it's out of warranty, I wouldn't sweat it. Dexos is mainly a marketing ploy where oil manufacturers pay royalties to gm in order to display the dexos logo (and increase their sales). Any decent (even store brand synthetic like Kirkland) can easily meet the dexos requirements. Synthetic blends rarely meet the reqs but there are some
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Apr 06, 2026 03:31 PM
3,572 Posts
Joined Apr 2010
bonbon525Apr 06, 2026 03:31 PM
3,572 Posts
Quote from Blue-Light-Special :
It's strange to me that a lot of peeps buy synthetic for more money and still change at 5k. Why pay for the synthetic if your changing at that interval seems like a waste of money to me. I'm at 10k each change VW turbo vehicle is 10 years old now no issues. And I short trip the crap of it. 😜😜.
5k oil change does seem a bit too much imo. I think it depends on the car as well. For example, a 10 year old prius u can get by with 10k oil change, but a sports car i would think around 7k is fine, depending on how the car was driven.

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