engine antifreeze

JRscooby wrote:
Not RVs, but on trucks I have heard that not keeping the right chemicals in the coolant leads to pinholes in the liners, coolant leaking into crankcase or combustion chamber.
Does the engine know what box it is in?

This is true for ANY linered engine.

Again for the OP, if you do not know how long the coolant has been in there or what it is, just drain, flush and go back with a new-generation OAT-based coolant. Then forget about it for 6 years. At that point, you might test it to see if you can go another year.

wallynm wrote:
I strongly suggest you pull a sample for chemical analysis after 12 years as it could be interesting. We always get a chemical analysis on every oil and coolant change.

Not sure about the "sample at change" Not RVs, but on trucks I have heard that not keeping the right chemicals in the coolant leads to pinholes in the liners, coolant leaking into crankcase or combustion chamber.
Does the engine know what box it is in?

I strongly suggest you pull a sample for chemical analysis after 12 years as it could be interesting. We always get a chemical analysis on every oil and coolant change.

wolfe10 wrote:
Scott,

Just going from the OP's first post-- he currently has green coolant. OE-- we have no idea.

Actually, not a bad idea to do a complete flush and go with one of the new-generation OAT based coolants.

I saw that, someone changed it or added green along the way. All Cummins engines of that year had pink stuff in them.
Odd thing about that pink color, it would fade in color rather quickly in a few years.

Scott,

Just going from the OP's first post-- he currently has green coolant. OE-- we have no idea.

Actually, not a bad idea to do a complete flush and go with one of the new-generation OAT based coolants.

wolfe10 wrote:

ScottG wrote:
Green fluid is wrong and can cause damage.

There absolutely ARE some green "approved" coolants for diesels. Most are the old-chemistry "low silicate with added SCA" type. With these, the SCA concentration needs to be checked annually and new added per test results.

From Cummins/Fleetguard pdf. Page 14 Fleetcool is green.

https://www.cumminsfiltration.com/sites/default/files/LT36504_Coolant_Products.pdf

Of course there are some green fluids meant for some diesels - but not the OP's.
His particular engine stipulates OAT and a specific Cummins spec number (CES) that the green stuff, even that made for some diesels by Fleetguard, doesn't.
And you picked the wrong Fleetcool. The OP's engine uses Fleetcool EX/ES formula, which is pink and was the original fill in back then.

You cannot judge a coolant by the color. Read your owners manual for coolant specs and then read the label on the coolant jug.

ScottG wrote:
Green fluid is wrong and can cause damage.

There absolutely ARE some green "approved" coolants for diesels. Most are the old-chemistry "low silicate with added SCA" type. With these, the SCA concentration needs to be checked annually and new added per test results.

From Cummins/Fleetguard pdf. Page 14 Fleetcool is green.

https://www.cumminsfiltration.com/sites/default/files/LT36504_Coolant_Products.pdf

Green fluid is wrong and can cause damage. Get it out of there.
Also, don't just get fluid for "diesels". Make sure it meets the Cummins spec.
This is the correct fluid for your particular angine: Zerex G05

Ranger Smith wrote:

Yosemite Sam1 wrote:
Drain the overflow tub and the radiator and replace it with regular anti freeze from Walmart.

Or have Walmart do it for you.

Not on my worst day.

You have either a Fleet Guard fully formulated which has the SCA's in it or you have an OAT coolant depending on the year of your rig. A call to Freightliner can tell you which they put in when built.

Freightliner wont be able to help him , his coach is built on a Roadmaster chassis .
I bought Peak million mile heavy duty diesel coolant at Wal-Mart
approx. 12.50 per gal .
Cummins/Fleetgard has decided that coolants are actually compatible .
So it appears that now you can drain the old coolant , blow out
what you can and refill .