Quote:
Originally Posted by bismic
I had the same question to answer for myself. At 50k I flushed the system without the VC9. I decided I would not re-do it MAINLY because I have a coolant filter and the last 3 filter changes did not have much solids. Also when I drained the fluid the first time during the flush procedure, I did not see any solids.
Do you have a coolant filter? Did you see any solids during any of the drains?
Your temperature differential does not seem too bad to me. Have you ever seen it over 15 *F - even before the flush?
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You are missing an important reason for using the flush on any diesel engine. The flush most importantly removes what is left the depleted and broken down protective layer that forms on the cylinder walls and other metal surfaces inside the cooling system. Once the system has been cleaned installing the correct coolant containing the SCA will allow a fresh layer to form providing continued protection from corrosion and cavitation erosion.
The coolant filter systems are not a bad idea and they do remove the debris from the system but you still need to service the system chemically. It is not wise to skip the flush.
