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Thought I would rap up this thread on coolant... I switched to CAT ELC coolant (the strawberry color). Runs great but had to do 4 flush and fills with water to make sure I got all the yellow stuff out first. Strangely, the CAT coolant was cheaper than aftermarket from my local CAT dealer...

OK, quick search gave me some info on diesel vs conventional antifreeze and why... http://www.motorhome.com/rv-how-to/rv-tech-tips/what-you-need-to-know-about-diesel-antifreeze-and-coolants/ Although, based on this article, the CAT 3116 isn't the type of diesel engine that "requires" special...

Hmmm. OK. I didn't realize there is "special" antifreeze for diesel engines. Some of the generic long life stuff says it is compatible with the standard coolant. Sounds like regardless I should to a drain and flush. Will investigate further.

I have a new block heater on the way and plan to go ahead and do a full drain and fill on the coolant. TM says ethyl glycol antifreeze but wondering if anyone has used a specific brand or type (long life, etc.) or will wally-world brand do just fine for the CAT 3116? Thanks for any assistance, OD