Posted 5/8/2010 10:17 AM (#439761) Subject: amsoil
Posts: 10
I ran Amsoil in my Johnson 115 and it worked great. I now have a Merc EFI 175 with a three quater full oil tank which I believe is 3 gallons, with Merc oil in it. Can I mix the two oils or do I have to wait until my oil tank is almost empty and then add the Amsoil.