The BG109 EPR I have been using on my daily drivers field a couple of years now right before the oil change.
Directions say to add the full can to the crankcase and let the engine idle or Rev up to 2000 rpms for 10-15 ,minutes on You Tube videos.
Cars and trucks with electric fans will likely get hot overheat in the summer, Electric fans can not keep up with above idle rpms sustaining not driving a Fact I learned know.
Only a Full Mechanical belt driven cooling Fan can.
I usually just let the engine idle for 30 minutes long.
Change the oil and filter.
It works like Marvel Mystery Oil but it's like 20 times more powerful effective.
Not a Snake oil, if you have an older engine there is sludge inside guarenteed fact.
Only a Few Premium high end Racing oils keep that sludge away and too expensive for a daily driver.
Oil may be clean to start.
After using dump the oil it's like pitch black coal oil, like dirty Semi Truck Diesel oil !
I even use on the 87 Corvette Convertible.
Main advantage it cleans the piston ring grooves effectively and especially the oil Return holes drilled or milled slots in the pistons.