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SUCHaDEAL 13.1K Views
Apr 29, 2026 11:51 AM

5-qt Castrol GTX High Mileage Synthetic Blend Motor Oil (10W-30)

$14

$24

41% off
w/ S&Sat Amazon
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Deal Details
Amazon has 5-qt Castrol GTX High Mileage Synthetic Blend Motor Oil (10W-30) on sale for $14.95 - $0.75 (5% Subscribe & Save discount) = $14.20. Shipping is free with Prime or on $35+ orders.

Thanks to community member SUCHaDEAL for finding this deal.

Available: Features:
  • Phosphorus Replacement Technology extends emission system life
  • Superior dispersancy fights sludge build up inside engine
  • Seal conditioners help reduce oil leaks from aging gaskets
  • Advanced additives prevent engine wear and improve fuel economy
  • Meets API SP/SN PLUS/SN/SM and ILSAC GF-6 specifications

Editor's Notes

Written by megakimcheelove | Staff
  • This offer matches previous Front Page deal that earned 53+ thumbs up.
  • This offer matches previous Front Page deal that earned 37+ thumbs up.
  • Don't have Amazon Prime? Students can get a free 6-Month Amazon Prime trial with free 2-day shipping, unlimited video streaming & more.
  • If you're not a student, there's also a free 1-Month Amazon Prime trial available.
No Longer Available:

Original Post

Written by SUCHaDEAL
Community Notes
About the Poster
Deal Details
Community Notes
About the Poster
Amazon has 5-qt Castrol GTX High Mileage Synthetic Blend Motor Oil (10W-30) on sale for $14.95 - $0.75 (5% Subscribe & Save discount) = $14.20. Shipping is free with Prime or on $35+ orders.

Thanks to community member SUCHaDEAL for finding this deal.

Available: Features:
  • Phosphorus Replacement Technology extends emission system life
  • Superior dispersancy fights sludge build up inside engine
  • Seal conditioners help reduce oil leaks from aging gaskets
  • Advanced additives prevent engine wear and improve fuel economy
  • Meets API SP/SN PLUS/SN/SM and ILSAC GF-6 specifications

Editor's Notes

Written by megakimcheelove | Staff
  • This offer matches previous Front Page deal that earned 53+ thumbs up.
  • This offer matches previous Front Page deal that earned 37+ thumbs up.
  • Don't have Amazon Prime? Students can get a free 6-Month Amazon Prime trial with free 2-day shipping, unlimited video streaming & more.
  • If you're not a student, there's also a free 1-Month Amazon Prime trial available.
No Longer Available:

Original Post

Written by SUCHaDEAL

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Top Comments

Kalpesh1972
17Comments
10Reputation
Why would someone buy a synthetic blend when Costco sells full synthetic at almost same price. Of course one will need a membership though. I think most cars mandates use of full synthetic.
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Community Reviews

This 10W 30 high mileage synthetic blend is framed as a practical oil for older engines, especially Camrys and other non turbo, non supercharged setups. It is described as helping reduce oil burn in a high mileage 2AZ FE and as working fine on a 230k mile Camry with 5,000 mile changes. The main hesitation is that full synthetic is often viewed as the better long term choice for modern engines, especially when the price gap is small. A $5 Castrol rebate is also available, which softens the cost.

  • A Castrol rebate can reduce the effective cost through Castrol promotions.

    mouthforwar

  • The synthetic blend may work for older, non-turbo, non-supercharged engines without timing chains.

    asuka

  • A 2004 Camry running 10W-30 synthetic blend every 5k miles reportedly ran without problems.

    HappyGame8333

  • Switching from full synthetic to synthetic blend plus additives reportedly slowed oil loss in a 2AZ-FE Camry.

    djdumbbii

  • The synthetic blend value can be questionable when full synthetic is available at nearly the same price elsewhere.

    Kalpesh1972

  • Full synthetic Kirkland pricing at Costco can undercut the deal price, especially when buying multiple jars.

    ssen2004

  • The deal may not be eligible if purchased from Amazon.

    WthaHatchet

  • Some guidance argues engine longevity depends more on oil change intervals and fresh filters than on choosing synthetic blend.

    WthaHatchet

Common Questions (4)

AI-generated summary based on comments from the community. Updated ago

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28 Comments

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Apr 29, 2026 8:44 PM
17 Comments
Joined Mar 2019
Kalpesh1972Apr 29, 2026 8:44 PM
17 Comments
Why would someone buy a synthetic blend when Costco sells full synthetic at almost same price. Of course one will need a membership though. I think most cars mandates use of full synthetic.
1
3
Apr 30, 2026 12:00 PM
312 Comments
Joined Dec 2010
Vanhook2Apr 30, 2026 12:00 PM
312 Comments
Quote from Kalpesh1972 View quoted comment :
Why would someone buy a synthetic blend when Costco sells full synthetic at almost same price. Of course one will need a membership though. I think most cars mandates use of full synthetic.
Post the link please.The lowest price I see for any oil 34.99 + tax.
1
1
Apr 30, 2026 12:36 PM
4.4K Comments
Joined Sep 2010
stegallApr 30, 2026 12:36 PM
4.4K Comments
Dang good prices, but I have no need. Repped.
Apr 30, 2026 10:19 PM
172 Comments
Joined Oct 2025
FancyTable532Apr 30, 2026 10:19 PM
172 Comments
I like Castrol.
Apr 30, 2026 10:38 PM
441 Comments
Joined Jan 2021
BeautifulLake409Apr 30, 2026 10:38 PM
441 Comments

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

Quote from Kalpesh1972 View quoted comment :
Why would someone buy a synthetic blend when Costco sells full synthetic at almost same price. Of course one will need a membership though. I think most cars mandates use of full synthetic.
You're so fos
1
1
Apr 30, 2026 10:39 PM
169 Comments
Joined Nov 2010
delliedogApr 30, 2026 10:39 PM
169 Comments
great oil ! Never thought I'd say this
Apr 30, 2026 10:56 PM
617 Comments
Joined Jul 2016
ssen2004Apr 30, 2026 10:56 PM
617 Comments
Quote from Vanhook2 View quoted comment :
Post the link please.The lowest price I see for any oil 34.99 + tax.
Today at Costco warehouse price is $29.99 after discounts for 2 jars of Kirkland full synchetic various 0-20/5-20 and more

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Apr 30, 2026 11:46 PM
22 Comments
Joined Apr 2019
uproApr 30, 2026 11:46 PM
22 Comments
Get it while oil is cheap
Apr 30, 2026 11:50 PM
938 Comments
Joined Sep 2013
chrisaf69Apr 30, 2026 11:50 PM
938 Comments
Do yourself a favor and just pay the few bucks more for full synthetic. Your engine will thank you many miles down the road.
May 1, 2026 12:26 AM
462 Comments
Joined Mar 2009
djdumbbiiMay 1, 2026 12:26 AM
462 Comments
Quote from Kalpesh1972 View quoted comment :
Why would someone buy a synthetic blend when Costco sells full synthetic at almost same price. Of course one will need a membership though. I think most cars mandates use of full synthetic.
I'm using synthetic blend on my 191263 mile 2AZ-FE, i4 04 Camry. It's leaking oil somewhere or just burning it off (engine known to burn oil), and i lose a quart of it every 3500 miles, when i used full synthetic, it burned off faster. now using some synthetic blend, and about 5 oz of oil additives, i don't lose a quart of synthetic oil as fast as i used to. Also, on the Mississippi Gulf Coast, we don't have Costco, nearest Costco is in the downtown part of New Orleans or head East for Mobile, Alabama. So Costco is somewhat not everywhere and within a short drive like you think it would be.
1
May 1, 2026 1:29 AM
359 Comments
Joined Aug 2025
CalmShoe2276May 1, 2026 1:29 AM
359 Comments
Good deal. Worse case I'll use in the mower.
May 1, 2026 1:38 AM
2.9K Comments
Joined Oct 2008
asukaMay 1, 2026 1:38 AM
2.9K Comments
This is good if you have an older engine with no turbocharger, supercharger, or timing chain.

But for most modern cars, get an API SQ rated full synthetic, if you plan on keeping it after the warranty ends. Proven to extend engine longevity.
1
1
May 1, 2026 6:03 AM
97 Comments
Joined Dec 2007
dbishop23May 1, 2026 6:03 AM
97 Comments
Good deal but full synthetic is better.
May 1, 2026 6:32 AM
1.1K Comments
Joined Apr 2014
mouthforwarMay 1, 2026 6:32 AM
1.1K Comments
$5 rebate (up to 3X) through Castrol: https://www.castrol.com/en_us/uni...tions.html

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May 1, 2026 10:40 AM
286 Comments
Joined Nov 2022
WthaHatchetMay 1, 2026 10:40 AM
286 Comments

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

Quote from asuka View quoted comment :
This is good if you have an older engine with no turbocharger, supercharger, or timing chain. But for most modern cars, get an API SQ rated full synthetic, if you plan on keeping it after the warranty ends. Proven to extend engine longevity.
It really doesn't improve engine life. Regular oil changes do. Sticking to a conventional change rate of every 3k miles or 5k for synthetic will be the thing that makes your engine last longer. I have a 3800series 1 v6 with 258k miles. Never had anything but conventional changes every 3k miles with new filter.
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