Coolant

If it were me I would just leave it alone and run it. Why spend money when you don't have to??

I switched my coolant to Cat ELC after flushing with distilled water. Zero problems.

7 years is 2X the recommended change interval for regular low silicate diesel coolant with SCA. If you are going to sell within a year, do nothing. If you are going to keep it, change it now.

I would flush, replace thermostats (called regulator by Caterpillar)as they recommend this as well and go back with Caterpillar ELC.


Cost is noise level compared with engine or radiator issues.

Been there, done that.

"Coolant maintenance for a 2001 Beaver Patriot Thunder, CAT C12."

I would change the coolant because it is at the manufacturers recommended change interval. (time)

I would NOT change the type of coolant, only replace what's currently there. (because it was initially recommended by the manufacturer.

Case in point. Years ago I owned multiple German cars. I know they aren't the same as the vehicle referenced above. The manufacturer called for G11 (blue) coolant. (2 year change interval) I changed the coolant to G12 (red extended change interval OAT technology coolant) thinking I was doing the vehicle a favor. Within two days, my heater core began leaking. A very expensive repair. Within a week, my plastic end cap copper core radiator began leaking. Another very expensive repair. At the same time my water pump shaft seal began leaking. Coincidence, . . . . . maybe, but I think not. IMO, if it's working as is, don't fix/change it. Just do the manufacturers recommended maintenance.

Chum lee

Chum lee wrote:


I would NOT change the type of coolant, only replace what's currently there. (because it was initially recommended by the manufacturer.

Case in point. Years ago I owned multiple German cars.
Chum lee

Not sure that experience is directly related to the Caterpillar C12 and Caterpillar ELC.

I have heard of no issues with ELC causing damage. Occasional dysfunction of Freightliner coolant level sensors-- yes.

Beaver Thunder wrote:
The service manger at my local CAT dealership suggested I keep with the standard in a older engine, said they have experienced problems when switching older engines over too the new extended life coolant. He said he didn't understand why but a few would develop leaks and had issue after a flush.

You either trust your local CAT dealer service manager or you don't.

Not sure there is any statistical data on this, so go with what works for you.

As a side issue, wonder how many of those components that failed with the new coolant would have failed just the same with the original coolant or replacement with original type coolant. Cooling system components DO fail.

If the lab says it's good.. Keep testing at least every year till the lab says CHANGE IT.

If you don’t change a fluid when the manufacturer says to do so, you can’t assure a buyer that you have done so. Smart buyers want to see the maintenance records.