Sure would be nice if it wasn't clear
Tough to tell when you got a leak

 

I use Fleetguards red extended life stuff. It's supposed to go 600K miles, so I'm good for life. I figure if it's good enough for OTR trucks and Cummins motors then it's good enough for me.

 

What did that cost a gal.?

 

I have read that pulling the thermostat and blowing compressed air into the orifice will help push remaining fluid out of the block. FWIW.

 

It was close to $20/gallon. Here's the literature on Fleetguard ES Optimax. Notice the organic acid information.

"FLEETGUARD ES Optimax™ EG Antifreeze/Coolants are Extended Life formulations that contain Ethylene Glycol base fluids and are designed specifically for use in heavy-duty diesel engines. ES Optimax™ EG Antifreeze Coolants are fully formulated with Organic Acid Inhibitors, and provide superior liner pitting and corrosion protection in diesel engines. ES Optimax™ antifreeze/coolants are phosphate, borate, amine, and silicate free, and contain proprietary anti-scale additives that eliminate the need for deionized water.

FLEETGUARD ES Optimax™ EG Concentrate mixes readily with clean tap water or demineralized water, while ES Optimax™ EG Premix is formulated with demineralized water and is ready to use. ES Optimax™ coolants are compatible with conventional antifreeze products and liquid SCA’s and standard water filters; however, mixing with conventional antifreeze may reduce the extended life characteristics of the product. ES Optimax™ EG Antifreezes are universal products highly recommended for use in all heavy-duty diesel engines, and also for use in automobile and light duty applications.
FLEETGUARD ES Optimax™ EG Antifreeze Coolants meet or exceed the performance requirements of the following specifications."

Here's a link to a site that has all the info you need:

http://www.terrabond.net/Files/Menus/ESOptimaxEG.pdf