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Castrol GTX Diesel 15W-40, CK4 #5328906 01/21/20 04:30 PM
Joined: Dec 2019
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HDoilDude Offline OP
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Shared for those who care.

[Linked Image]

Re: Castrol GTX Diesel 15W-40, CK4 [Re: HDoilDude] #5328927 01/21/20 04:48 PM
Joined: Mar 2015
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53' Stude Online Content
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Looks good, Thank You for VOA sir smile


2009 Toyota Camry LE

161,669 miles

Valvoline Maxlife Synthetic 5w20 Dexos 1 Gen 2 SN+
Fram tough guard 4386 filter
Re: Castrol GTX Diesel 15W-40, CK4 [Re: HDoilDude] #5328997 01/21/20 06:24 PM
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tundraotto Offline
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Looks fine - a shame its not more economical. I suspect that's the reason for it not being more popular.

Re: Castrol GTX Diesel 15W-40, CK4 [Re: HDoilDude] #5329048 01/21/20 07:01 PM
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HDoilDude Offline OP
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You're welcome!

I got a gallon for 12 bucks at Wally World. Not the cheapest but not too pricey for the average Joe.

Re: Castrol GTX Diesel 15W-40, CK4 [Re: HDoilDude] #5329111 01/21/20 08:20 PM
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Carbon12 Offline
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Nice to see it has the traditional HDEO levels of zddp. Thanks for posting.

Re: Castrol GTX Diesel 15W-40, CK4 [Re: HDoilDude] #5329226 01/22/20 04:24 AM
Joined: Mar 2015
Posts: 14,595
53' Stude Online Content
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HDOilDude: rural king near me has plenty of this in stock as well smile


2009 Toyota Camry LE

161,669 miles

Valvoline Maxlife Synthetic 5w20 Dexos 1 Gen 2 SN+
Fram tough guard 4386 filter
Re: Castrol GTX Diesel 15W-40, CK4 [Re: 53' Stude] #5329831 01/22/20 07:37 PM
Joined: Dec 2019
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HDoilDude Offline OP
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My closest Rural King is a couple hours away frown

That's where I get Delvac ESP on the cheap, though!

Good to know for the GTX. Heck, this GTX tests almost identically to the ESP except for its lack of Boron compared to the ESP synth.

Last edited by HDoilDude; 01/22/20 07:41 PM.
Re: Castrol GTX Diesel 15W-40, CK4 [Re: HDoilDude] #5330190 01/23/20 10:18 AM
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rileyc Offline
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The formulation of Castrol GTX Diesel 15W40 appears to meet all the CK4 requirements. The only source for this HDEO near me is Walmart, and the price is $12.37/gal which is inline with other major oil blenders. However, most of the major blenders offer rebates throughout the year making their net price much lower than Castrol GTX Diesel. In my opinion, Castrol needs to offer rebates on GTX Diesel as an incentive for customers to try this HDEO. Based upon the formulation of Castrol GTX Diesel and current retail pricing, there are no compelling reasons to try this oil.

Re: Castrol GTX Diesel 15W-40, CK4 [Re: rileyc] #5330217 01/23/20 10:48 AM
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kschachn Offline
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Originally Posted by rileyc
The formulation of Castrol GTX Diesel 15W40 appears to meet all the CK4 requirements. The only source for this HDEO near me is Walmart, and the price is $12.37/gal which is inline with other major oil blenders. However, most of the major blenders offer rebates throughout the year making their net price much lower than Castrol GTX Diesel. In my opinion, Castrol needs to offer rebates on GTX Diesel as an incentive for customers to try this HDEO. Based upon the formulation of Castrol GTX Diesel and current retail pricing, there are no compelling reasons to try this oil.

Well it more than "appears" that way, it does show up on the API EOLCS Directory.


1994 BMW 530i, 251K
1996 Honda Accord, 280K
1999 Toyota Sienna, 430K
2000 Toyota ECHO, 284K
Re: Castrol GTX Diesel 15W-40, CK4 [Re: HDoilDude] #5330225 01/23/20 10:55 AM
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Fraser434 Offline
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Good to see an oil with a decent additive package and a nice dose of moly, where many of the 15W40's are switching to a 800ppm zinc/phos package, even a recent Delvac 1300 UOA looks lean on additives. May try this oil.

Last edited by Fraser434; 01/23/20 10:55 AM.
Re: Castrol GTX Diesel 15W-40, CK4 [Re: Fraser434] #5330684 01/23/20 08:42 PM
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HDoilDude Offline OP
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Originally Posted by Fraser434
Good to see an oil with a decent additive package and a nice dose of moly, where many of the 15W40's are switching to a 800ppm zinc/phos package, even a recent Delvac 1300 UOA looks lean on additives. May try this oil.



That's basically what I was thinking.

I don't mind paying a few dollars extra per gallon for a little more additive-heavy oil.

I may run it this spring/summer and see how it holds up.

Re: Castrol GTX Diesel 15W-40, CK4 [Re: HDoilDude] #5336202 01/30/20 08:28 AM
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SR5 Offline
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Looks good, 1155 ppm zinc, TBN above 9 with a good Ca & Mg mix, and a slug of Moly (~ 60).


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Valvoline DuraBlend 10W40 SN & A3/B4 semi-synthetic + Valvoline V06 synblend media filter
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