Is it cool to use the Penzoil Marine 15w-40 that indmar uses? We do run extra ballast but would be changing the oil every 20-30 hours ourselves. Thanks in advance.
I've heard from mechanics that penzoil is the worst oil out there, valvoline, or castrol is better, i have a centurion and my manual says to use 30 wt.
Pennzoil is fine. I don't use it but it is well refined. I use pure synthetic because it's better when you start at the beginning of the day and I don't have to change it too often. (Lazy) Mobil One.