Slickdeals is community-supported.  We may get paid by brands for deals, including promoted items.
frontpagephoinix | Staff posted Mar 25, 2026 01:38 PM
  1. Deal Image
Item 1 of 3
  1. Deal Image
  2. Deal Image
  3. Deal Image
Item 1 of 3
frontpagephoinix | Staff posted Mar 25, 2026 01:38 PM

5-Qt Castrol GTX Full Synthetic Motor Oil (5W-30)

w/ S&S

$19

$25

24% off
Amazon
42 Comments 10,325 Views
Get Deal at Amazon
Good Deal
Save
Share
Deal Details
Amazon has Castrol GTX Full Synthetic 5W-30 Motor Oil, 5 Quarts for $20.37 - 5% when you check out via Subscribe & Save = $19.35. Shipping is free with Prime or on $35+ orders.

Note: You have the flexibility to manage your Subscribe & Save subscription at any time after your order ships. View Subscribe & Save filler items and our current Subscribe & Save Frontpage deals to unlock up to extra 15% savings when you have 5 or more items in your current monthly subscription.

Thanks to Deal Hunter phoinix for finding this deal.

Features:
  • 6X better wear protection on critical engine parts than industry standards
  • 1.3X better sludge protection than industry standards
  • 3X Stronger against viscosity breakdown than leading full synthetic
  • Protection for 10,000 miles between oil changes

Editor's Notes

Written by powerfuldoppler | Staff
  • About this deal:
    • Our research indicates that this offer is $4.60 lower (19% savings) than the next best available price from a reputable merchant with prices starting from $23.95
  • About this product:
    • Rating of 4.8 from over 3400 customer reviews.
  • About this store:

Original Post

Written by phoinix | Staff
Product Info
Community Notes
About the Poster
Deal Details
Product Info
Community Notes
About the Poster
Amazon has Castrol GTX Full Synthetic 5W-30 Motor Oil, 5 Quarts for $20.37 - 5% when you check out via Subscribe & Save = $19.35. Shipping is free with Prime or on $35+ orders.

Note: You have the flexibility to manage your Subscribe & Save subscription at any time after your order ships. View Subscribe & Save filler items and our current Subscribe & Save Frontpage deals to unlock up to extra 15% savings when you have 5 or more items in your current monthly subscription.

Thanks to Deal Hunter phoinix for finding this deal.

Features:
  • 6X better wear protection on critical engine parts than industry standards
  • 1.3X better sludge protection than industry standards
  • 3X Stronger against viscosity breakdown than leading full synthetic
  • Protection for 10,000 miles between oil changes

Editor's Notes

Written by powerfuldoppler | Staff
  • About this deal:
    • Our research indicates that this offer is $4.60 lower (19% savings) than the next best available price from a reputable merchant with prices starting from $23.95
  • About this product:
    • Rating of 4.8 from over 3400 customer reviews.
  • About this store:

Original Post

Written by phoinix | Staff

Community Voting

Deal Score
+64
Good Deal
Get Deal at Amazon

Leave a Comment

Unregistered (You)

42 Comments

Sign up for a Slickdeals account to remove this ad.

Mar 25, 2026 02:54 PM
158 Posts
Joined Nov 2015
An-NguyenMar 25, 2026 02:54 PM
158 Posts
I just bought 4 pack of 6 mobil 1 oil, how is this compare to mobil 1 extended performance
Mar 25, 2026 03:24 PM
295 Posts
Joined Oct 2018
FancyWren413Mar 25, 2026 03:24 PM
295 Posts
Great price for full synthetic oil. Ordered 2 as my vehicle takes 6 quarts.
Mar 25, 2026 04:06 PM
373 Posts
Joined Sep 2008
fknbMar 25, 2026 04:06 PM
373 Posts
looks like other velocity is also on sale.
Mar 25, 2026 04:45 PM
9,869 Posts
Joined Nov 2013
AdelleyMar 25, 2026 04:45 PM
9,869 Posts
Dang, not 503 spec
1
Mar 25, 2026 04:47 PM
72 Posts
Joined Jan 2020
FancyLaborer769Mar 25, 2026 04:47 PM
72 Posts
Quote from fknb :
looks like other velocity is also on sale.
*viscosity
1
Mar 25, 2026 04:59 PM
257 Posts
Joined Feb 2008
alchargoMar 25, 2026 04:59 PM
257 Posts
Unsure if Amazon qualifies but if it does:

https://apfco.org/secured/digital...CTS/R13994
1
Mar 25, 2026 04:59 PM
1,250 Posts
Joined Oct 2005
epenterprisesMar 25, 2026 04:59 PM
1,250 Posts
Tempting to stock up

Sign up for a Slickdeals account to remove this ad.

Mar 25, 2026 05:11 PM
478 Posts
Joined Dec 2013

This comment has been rated as unhelpful by Slickdeals users.

Mar 25, 2026 05:24 PM
334 Posts
Joined Sep 2021
JollyLanguage1998Mar 25, 2026 05:24 PM
334 Posts
Quote from zen_cohen :
Used to buy these often for my oil-guzzling Outback, but recently got an EV6 and never have to deal with oil and gas again. Reliable charging on long road trips is my biggest worry, but it's been a great trade-off, and love having 320 HP and over 450 lb-ft of torque.
Wow!!
Mar 25, 2026 05:33 PM
352 Posts
Joined Aug 2019
OrangeApparel8487Mar 25, 2026 05:33 PM
352 Posts
This is good stuff. This is the former Magnatec. Great for ecoboost engines.
Mar 25, 2026 05:34 PM
352 Posts
Joined Aug 2019
OrangeApparel8487Mar 25, 2026 05:34 PM
352 Posts
Quote from zen_cohen :
Used to buy these often for my oil-guzzling Outback, but recently got an EV6 and never have to deal with oil and gas again. Reliable charging on long road trips is my biggest worry, but it's been a great trade-off, and love having 320 HP and over 450 lb-ft of torque.
[IMG]https://media0.giphy.com/media/v1.Y2lkPTI5MDMyOTZhYjVkNnhtNWE3MHFoeDl2ZHQzamhkZDUzaDJueDltZzJibmt2cWE3ciZlcD12MV9naWZzX3NlYXJjaCZjdD1n/IguTdo3MPMeZM6Bzc1/giphy.gif[/IMG]bigthumbup
Pro
Mar 25, 2026 05:41 PM
2,628 Posts
Joined Sep 2011
DealSeekerDeal
Pro
Mar 25, 2026 05:41 PM
2,628 Posts
Once you go Synthetic, you never go back...
Mar 25, 2026 06:38 PM
4,010 Posts
Joined Dec 2011
ebolaboiMar 25, 2026 06:38 PM
4,010 Posts
Quote from zen_cohen :
Used to buy these often for my oil-guzzling Outback, but recently got an EV6 and never have to deal with oil and gas again. Reliable charging on long road trips is my biggest worry, but it's been a great trade-off, and love having 320 HP and over 450 lb-ft of torque.
Cars aren't supposed to go through oil like that. Maybe you should have gotten it fixed instead of buying oil all the time? LOL! Watch out for that ICCU?
Last edited by ebolaboi March 25, 2026 at 11:43 AM.
1
1
Mar 25, 2026 07:26 PM
478 Posts
Joined Dec 2013
zen_cohenMar 25, 2026 07:26 PM
478 Posts
Quote from ebolaboi :
Cars aren't supposed to go through oil like that. Maybe you should have gotten it fixed instead of buying oil all the time? LOL! Watch out for that ICCU?
It did leak but it still burned oil after repairing the leaks. And, yeah, the ICCU is a potential downside, but it's still worth the pretty small risk AFAIC.

Sign up for a Slickdeals account to remove this ad.

Mar 25, 2026 07:45 PM
10 Posts
Joined Nov 2013
Yoshi8765Mar 25, 2026 07:45 PM
10 Posts
Quote from alchargo :
Unsure if Amazon qualifies but if it does:

https://apfco.org/secured/digital...CTS/R13994
seems like this won't work with amazon?

Leave a Comment

Unregistered (You)

Related Searches

AutosMotor OilCastrolAmazon

Popular Deals

See All
Found by phoinix
Today 07:35 AM
Forum Thread
$31.99* | 3-Speed Wolfbox MF60 Electric Compressed Air Duster w/ 5 Nozzles at Amazon$32$50
36% off
1
Found by kalukola
Today 01:52 AM
Forum Thread
walmart - $13.22 Great Value Disposable Paper Plates, 8.5", 300 Count 4.7 stars out of 29235 reviews (4.7) | 29.2K ratings$13
1
Found by JohnDubya
Yesterday 03:51 PM
Forum Thread
$21.20: Hanes Men's Short Sleeve T-Shirt Pack, Big & Tall, Crewneck Cotton T-Shirts for Men, Value Packs, Charcoal Heather - 6 Pack, X-Large$21$40
47% off
3
Found by phoinix
Today 11:11 AM
Forum Thread
$7.73* | 17-Piece Melissa & Doug Wooden Play Food Cutting Fruit Set & More at Amazon$7.73$31
75% off
1
Found by phoinix
Today 05:58 AM
Forum Thread
$170.99 | DEWALT DCE570D1 20V MAX* Caulking Gun/Adhesive Gun, 29-oz at Woot!$171$675
74% off
0

Trending Deals

See All
Found by babgaly
Today 06:18 AM
Forum Thread
Flexino 5-in-1 Retractable Foldable Plug Charger (White) $14.69 + Free Shipping w/ Prime or on $35+$15$35
57% off
4
Found by phoinix
Today 08:06 AM
Forum Thread
$86.87 | Amazon Basics UPS Battery Backup & Surge Protector, 1000VA/550W, 9 Outlets at Amazon$87$120
27% off
3
Found by Dr.W
Today 07:58 AM
Forum Thread
MSI Aegis Z2 Gaming PC (Cert. Refurb): Ryzen 7 8700F, RTX 5070 Ti, 32GB DDR5, 2TB SSD $1449.99$1,450$2,300
36% off
4
Found by Taco_Doomsday
Today 05:24 AM
Forum Thread
DEWALT DCE530B, 20V MAX Heat Gun, Cordless, Up to 990 Degrees, LED Light,Tool Only $100$90$199
54% off
3
Found by ItsSoCheap
Today 09:00 AM
Forum Thread
39-Piece Stalwart Magnetic Screwdriver Set Tool Kit w/ Storage Rack $17.76 + Free S&H w/ Walmart+ or on $35+$18$27
33% off
0