The reason I ask about Eco-Pro is that my s28i runs about 215 deg F on a hot day with AC on and no Eco-Pro.
With Eco-Pro on the temp can run up to 236 deg f. I use a Scangauge II so I know the temps in real time.
I might use Eco-pro in winter for short trips to get temps up, but I'll never use it on any warm day.
I think running engine hotter can ruin that plastic valve cover sooner.
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