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Difinitive Answer for SCA, Silicates, and Diesels #5218393 09/20/19 11:11 PM
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ErikLeifson Offline OP
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New here, and before I ask, I'll give the disclaimer that i've done a bunch of searching without finding a clear answer.

My truck is a diesel. I just drained my coolant and put in some O'reilly's plain green with HyperLube Super Coolant for Diesels. Pretty sure the coolant is full of Silicates, since it says "protects aluminum". That being said, am I safe to leave this coolant in for a year or so? How long before the gelling or the precipitates start falling out? It was implied on one of these threads that it takes a couple years for problems to show up.

Any good answers? Thanks.

1993 Ford F-250
7.3 idi turbo

Screenshot_20190920-211046_Drive.jpg
Data sheet for HyperLube diesel super coolant

Last edited by ErikLeifson; 09/20/19 11:12 PM.
Re: Difinitive Answer for SCA, Silicates, and Diesels [Re: ErikLeifson] #5218576 09/21/19 07:26 AM
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bullwinkle Offline
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I personally use green low silicate coolant, DCA2 (NAPA Cool liquid), and a coolant filter containing DCA-2 to protect my 7.3 IDI. I have read that the gaskets & seals in the older 6.9/7.3 IDI are not compatible with newer OAT coolants, nor DCA4 SCAs. People have used them, but I didn't want to risk it. I tend to be a little suspicious of one-size-fits-all marketing claims for diesel ungines-the old ones were not built to use the newer stuff.


06 Ram 3500 CTD 4X4(FG Venturi), 93 GMC C3500 6.2, 89 F-450 7.3, 98 XJ 4.0(XG8A), 05 xB(XG3600), 18 Transit 3.7, 03 Merc Grand Marquis 4.6 2V(XG2)
Re: Difinitive Answer for SCA, Silicates, and Diesels [Re: ErikLeifson] #5218618 09/21/19 08:31 AM
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FordCapriDriver Offline
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Originally Posted by ErikLeifson
New here, and before I ask, I'll give the disclaimer that i've done a bunch of searching without finding a clear answer.

My truck is a diesel. I just drained my coolant and put in some O'reilly's plain green with HyperLube Super Coolant for Diesels. Pretty sure the coolant is full of Silicates, since it says "protects aluminum". That being said, am I safe to leave this coolant in for a year or so? How long before the gelling or the precipitates start falling out? It was implied on one of these threads that it takes a couple years for problems to show up.

Any good answers? Thanks.

1993 Ford F-250
7.3 idi turbo


On that sheet i don't see Sodium Silicate being mentioned anywhere, looks like a pretty standard conventional Diesel coolant with Nitries, Nitrates, Borate and Benzotriazole.
Protects Aluminum doesn't mean it has Silicates, although Silicates are well known to be excellent at protecting Alu.


1975 Ford Capri II Ghia 3000 V6 - Repsol Elite Super 20W-50
1988 Ford Escort XR3i Cabrio - Shell Rimula R4X 15W-40 HDEO

Re: Difinitive Answer for SCA, Silicates, and Diesels [Re: ErikLeifson] #5218715 09/21/19 10:26 AM
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When you look at a product like Zerex green conventional fluid, they state the specifications as meeting ASTM D4985 - low silicate coolant suitable for use in heavy duty diesel engines with a compatible SCA.

You go to the O'Reilly site and their conventional green coolant specs. says it's a universal coolant that contains OAT inhibitors. If it is really a conventional IAT coolant, then their site is incorrect. But, it does give me pause to use their product if they cannot get the description correct.

Re: Difinitive Answer for SCA, Silicates, and Diesels [Re: ErikLeifson] #5218731 09/21/19 10:40 AM
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ErikLeifson Offline OP
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Sorry, that data sheet is for the coolant additive. It has cavitation protection. The green stuff from oreilly's says on the label "protects aluminum from corrosion" (palm slaps forehead). Granted, I bought the jugs about a year ago without giving it much thought. But I can't seem to figure out if it will react badly with my non low-silicate green coolant. It claims it will work with "all diesel coolants". I keep reading about precipitates and gels forming that clog things up, but do those things only occur after a couple years? I plan on just draining the thing every year or so.

Hyper Lube stuff: https://www.hyperlube.com/product/diesel-super-coolant/

Last edited by ErikLeifson; 09/21/19 10:48 AM. Reason: clarification
Re: Difinitive Answer for SCA, Silicates, and Diesels [Re: doitmyself] #5218760 09/21/19 11:06 AM
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ErikLeifson Offline OP
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*Hand slaps forehead again...* Gosh, I feel like an idiot...

Sorry for the trouble. I just found the low silicate statement on the bottle... In my defense, it was in fine print where I never expected it to be. Here are some pictures. So you can probably buy green coolant from o'reilly auto parts with confidence. I bet it's the same stuff as Napa. At least we know one more supplier of the good stuff now! I guess I have nothing to worry about. What a relief. Thanks for the help!

[Linked Image]
[Linked Image]
[Linked Image]

Last edited by ErikLeifson; 09/21/19 11:07 AM.
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