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frontpage Posted by ArseneWenger • Last Tuesday
frontpage Posted by ArseneWenger • Last Tuesday

5-qt Castrol GTX Full Synthetic Motor Oil: 0W-20 $22.75, 5W-20

w/ Subscribe & Save

$20

$26

23% off
Amazon
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Deal Details
Amazon has 5-qt Castrol GTX Full Synthetic Motor Oil (5W-20) on sale for $21.08 - $1.05 (5% Subscribe & Save discount) = $20.03. Shipping is free with Prime or on $35+ orders.

Amazon has 5-qt Castrol GTX Full Synthetic Motor Oil (0W-20) on sale for $23.96 - $1.20 (5% Subscribe & Save discount) = $22.76. Shipping is free with Prime or on $35+ orders.

Thanks to community member ArseneWenger 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 megakimcheelove | Staff

Original Post

Written by ArseneWenger
Community Notes
About the Poster
Deal Details
Community Notes
About the Poster
Amazon has 5-qt Castrol GTX Full Synthetic Motor Oil (5W-20) on sale for $21.08 - $1.05 (5% Subscribe & Save discount) = $20.03. Shipping is free with Prime or on $35+ orders.

Amazon has 5-qt Castrol GTX Full Synthetic Motor Oil (0W-20) on sale for $23.96 - $1.20 (5% Subscribe & Save discount) = $22.76. Shipping is free with Prime or on $35+ orders.

Thanks to community member ArseneWenger 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 megakimcheelove | Staff

Original Post

Written by ArseneWenger

Community Voting

Deal Score
+49
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Top Comments

looser24
1334 Posts
127 Reputation
Here's a wild idea, maybe you should use the oil specs that your owners manual says to use.

22 Comments

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Last Tuesday
3,923 Posts
Joined Aug 2011

This comment has been rated as unhelpful by Slickdeals users.

Last Tuesday
97 Posts
Joined Nov 2014
Last Tuesday
jard1s
Last Tuesday
97 Posts
Quote from fritzo :
Just a quick tip- probably not good to use this in the summer as it's a thinner oil. This is more on a cold winter oil.

Theoretically correct that it functions better in the cold than 0w but should be fine for summer as well.
Last Tuesday
1,334 Posts
Joined Oct 2016
Last Tuesday
looser24
Last Tuesday
1,334 Posts

Our community has rated this post as helpful. If you agree, why not thank looser24

Here's a wild idea, maybe you should use the oil specs that your owners manual says to use.
7
2
1
Last Tuesday
716 Posts
Joined Nov 2012
Last Tuesday
slickbanger
Last Tuesday
716 Posts
Quote from looser24 :
Here's a wild idea, maybe you should use the oil specs that your owners manual says to use.
Oil is oil ask your brother diddy👌
7
Original Poster
Pro
Last Tuesday
2,969 Posts
Joined Feb 2011
Last Tuesday
ArseneWenger
Last Tuesday
Original Poster
Pro
2,969 Posts
The higher end "Edge" line is also the same price for 0W-20.
Last Tuesday
919 Posts
Joined May 2007
Last Tuesday
goixiz
Last Tuesday
919 Posts
Quote from fritzo :
Just a quick tip- probably not good to use this in the summer as it's a thinner oil. This is more on a cold winter oil.
depends on your motor not a general statement
Last Tuesday
432 Posts
Joined Jun 2011

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Last Tuesday
343 Posts
Joined Apr 2010
Last Tuesday
rs21
Last Tuesday
343 Posts
Walmart price is $21.03, https://www.walmart.com/ip/Castro...om=/search

Will get it from walmart
Last Tuesday
44 Posts
Joined Jul 2022
Last Tuesday
PurpleLadybug1016
Last Tuesday
44 Posts
Quote from robvas :
Shame there's no 5-30 or 5-40

0-20 and 5-20 are a joke

Try this
https://a.co/d/bbpzbHh
Last Tuesday
1,246 Posts
Joined Sep 2011
Last Tuesday
Souka
Last Tuesday
1,246 Posts
Quote from robvas :
Shame there's no 5-30 or 5-40

0-20 and 5-20 are a joke
Guess you won't like the 0w-8 that's out now. shake head


I got 3 cars, 3 different oil weight spec.
0w-20, 5w-20, 5w-30

to keep life a bit simpler I run 5w-30 in the 5w-20 spec vehicle.
All have VVT... the 5w-30 is no problem for the 5w-20 spec motor, it was implemented to improve MPG.
Far as flow and wear, after 130k miles, the mpg difference is hardly noticeable. oil tests show no change in engine wear metals either.

My $.02
Last edited by Souka June 24, 2025 at 12:16 PM.
Last Tuesday
188 Posts
Joined Dec 2010
Last Tuesday
tmony
Last Tuesday
188 Posts
Quote from ArseneWenger :
The higher end "Edge" line is also the same price for 0W-20.
Link?
Last Tuesday
561 Posts
Joined Dec 2012
Last Tuesday
fsu67
Last Tuesday
561 Posts
my car is leaking oil and I don't use full synthetic anymore because it leaks out much faster when I do, started using blend and I noticed the difference. someday I'll fix that rear main seal! 😆
1
1
Last Tuesday
30 Posts
Joined Jan 2022
Last Tuesday
SociableSeed594
Last Tuesday
30 Posts
Quote from looser24 :
Here's a wild idea, maybe you should use the oil specs that your owners manual says to use.
The oil specs your manual says to use are literally to maximize fuel efficiency and they prioritize that over engine longevity.
2
Last Tuesday
432 Posts
Joined Jun 2011
Last Tuesday
robvas
Last Tuesday
432 Posts
Quote from Souka :
Guess you won't like the 0w-8 that's out now. shake headI got 3 cars, 3 different oil weight spec.0w-20, 5w-20, 5w-30to keep life a bit simpler I run 5w-30 in the 5w-20 spec vehicle.All have VVT... the 5w-30 is no problem for the 5w-20 spec motor, it was implemented to improve MPG.Far as flow and wear, after 130k miles, the mpg difference is hardly noticeable. oil tests show no change in engine wear metals either.My $.02
Have a Honda not a Toyota so they want 0W-16

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Last Wednesday
371 Posts
Joined Feb 2010
Last Wednesday
allusuc
Last Wednesday
371 Posts
Is this better than Valvoline restore and protect? It's $30 at Walmart

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