Number 1: It says, it really doesn't like bypass thermostat setups, isn't that what's in our cars? It says to use a full-flow thermostat ideally one made by them.

Number 2: It says to block off the weep hold in the water pump (or use a water pump by them).

Number 3: It talks about blocking the overflow tube outlet, apparently if there is an issue with vacuum being created and air being sucked in.
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I didn't see this in any of my instructions. That may have applied to their earliest product which was made strictly for racing applications. Regarding its toxicity, "The U.S. CPSC has not granted a waiver for Evans NPG+ with respect to labeling requirements for products containing ethylene glycol. Evans NPG+must be regarded for purposes of handling and disposal in the same category as a conventional ethylene glycol based antifreeze."

IOW, even though it's less toxic, it's still considered EG for safety purposes.

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'83 300D, 126K miles.

In the video, Jay Leno says you can drink Evans coolant.

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85 300D turbo pristine w 157k when purchased 167,870 July 2025
83 300 D turbo 297K runs great. SOLD!
83 240D 4 spd manual- parted out then junked