Coolant Type
Thread Starter
Heel & Toe
Joined: Nov 2016
Posts: 18
Likes: 0
From: Northampton England (UK)
Coolant Type
Hello all.
I have to top up my coolant in my '94 C4 LT1. I can see that there is Green coloured coolant in there, and I understand that I'll need to use the same spec. coolant else I could have issues with coagulating coolant etc.
I have purchased some Comma XStream G48 coolant, that conforms to BS 6580:2010.
I know that the owner's manual states GM spec 1825M is to be used, but when asking for it the vendor told me that this is the stuff I needed.
It doesn't specifically state GM 1825M on the bottle, and is a dark green/blue colour. I'm worried pouring this in as a top up could damage the engine if it isn't compatible with what is in there already.
I know it's a rather generic question about a very specific product, and I'm sorry if it's a dumb thing to ask, but can anyone tell me if this is OK to use? I'd rather look stupid and ask first
Link to product is below:
http://www.commaoil.com/passenger-ve...view/563/XSG1L
I have to top up my coolant in my '94 C4 LT1. I can see that there is Green coloured coolant in there, and I understand that I'll need to use the same spec. coolant else I could have issues with coagulating coolant etc.
I have purchased some Comma XStream G48 coolant, that conforms to BS 6580:2010.
I know that the owner's manual states GM spec 1825M is to be used, but when asking for it the vendor told me that this is the stuff I needed.
It doesn't specifically state GM 1825M on the bottle, and is a dark green/blue colour. I'm worried pouring this in as a top up could damage the engine if it isn't compatible with what is in there already.
I know it's a rather generic question about a very specific product, and I'm sorry if it's a dumb thing to ask, but can anyone tell me if this is OK to use? I'd rather look stupid and ask first
Link to product is below:
http://www.commaoil.com/passenger-ve...view/563/XSG1L
Team Owner
Joined: Dec 1999
Posts: 34,873
Likes: 487
From: Lacey WA RVN 68-69
NCM Sinkhole Donor
Your '94 uses a green coolant that is an ethylene glycol solution. Searched the Amazon UK website and came up with this coolant that meets the GM1825M spec. You may want to look at the specs of this coolant and see if what you bought has any similar specification or make/model suitability.
The green ethlyene glycol coolants should be flushed and refilled every 2-3 years. So if the coolant in the car is that old, you may want to do a complete flush/fill with fresh coolant. The Amazon listing doesn't say if it's a concentrate or not.
The green ethlyene glycol coolants should be flushed and refilled every 2-3 years. So if the coolant in the car is that old, you may want to do a complete flush/fill with fresh coolant. The Amazon listing doesn't say if it's a concentrate or not.
Melting Slicks
Joined: Dec 2008
Posts: 2,772
Likes: 64
From: Mystic CT
If you only need to top off any quality ethylene glycol will be fine. If due for change I would put it off until winter and the car laid up in the garage. Personally I plan all the large things for the winter and only deal with must do now items in the summer.
Race Director
Joined: Mar 2015
Posts: 15,926
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How can you be sure what he has?
Burning Brakes
Joined: Jun 2016
Posts: 761
Likes: 66
From: Fitzwilliam New Hampshire
Owners manual says ethylene glycol= green from factory .Not newer orange type.I have been useing Peak long life ethylene glycol.Keep useing this type.Even when you do system flush.
Last edited by A Peter C4; Dec 3, 2016 at 06:23 PM.
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Thread Starter
Heel & Toe
Joined: Nov 2016
Posts: 18
Likes: 0
From: Northampton England (UK)
Thanks for the replies it literally only requires a top up for now but previous owner did tell me he had replaced all the fluids. Apparently just not enough of it. I will be doing a complete flush as recommended over the winter with a proper GM spec coolant, this exercise is really just to get rid of the low coolant light for now. I suspect there may be a minor leak someplace. The vast majority of comments I've read have recommended the green coolant in any case so I think I'll stick with it. Thanks again all
it literally only requires a top up for now but previous owner did tell me he had replaced all the fluids. Apparently just not enough of it. I will be doing a complete flush as recommended over the winter with a proper GM spec coolant, this exercise is really just to get rid of the low coolant light for now. I suspect there may be a minor leak someplace. The vast majority of comments I've read have recommended the green coolant in any case so I think I'll stick with it. Thanks again all
Melting Slicks
Joined: Dec 2008
Posts: 2,772
Likes: 64
From: Mystic CT
Asa kid never got the big box of crayons so pick 1 of 8 colors and I am ok. Fuscia have no idea. Salmon is wide open as talking farm raised or Copper River Canyon? Farm stuff this pale sickly looking crap that screams throw me out I have gone bad to the good stuff a very deep pink to almost red. Green is easy had that crayon in the box of 8. LOL
Race Director
Joined: Mar 2015
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Asa kid never got the big box of crayons so pick 1 of 8 colors and I am ok. Fuscia have no idea. Salmon is wide open as talking farm raised or Copper River Canyon? Farm stuff this pale sickly looking crap that screams throw me out I have gone bad to the good stuff a very deep pink to almost red. Green is easy had that crayon in the box of 8. LOL
Melting Slicks
Joined: Dec 2008
Posts: 2,772
Likes: 64
From: Mystic CT
Race Director
Joined: Mar 2015
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I used to pick old lawnmowers and take them apart and learned how to fix them after awhile. 
Melting Slicks
Joined: Jul 2008
Posts: 2,269
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From: Ottawa Ontario
Thanks for the replies it literally only requires a top up for now but previous owner did tell me he had replaced all the fluids. Apparently just not enough of it. I will be doing a complete flush as recommended over the winter with a proper GM spec coolant, this exercise is really just to get rid of the low coolant light for now. I suspect there may be a minor leak someplace.
it literally only requires a top up for now but previous owner did tell me he had replaced all the fluids. Apparently just not enough of it. I will be doing a complete flush as recommended over the winter with a proper GM spec coolant, this exercise is really just to get rid of the low coolant light for now. I suspect there may be a minor leak someplace.