I Have a 38 cigarette. JoMar racing did the motors 40 hours ago they are Bowtie Big Block Tall Deck's Solid Roller Cams 600h.p. each. I work for Don Gooley Cadillac and a 30 year mechinac here said the 15w 50 mobile 1 is great because the boat dont really run at high temp and to make sure I put a zinc additive in the oil.
Now others tell me to run the Brad Penn 20/50 and it has the zinc already in it. I run around 3200-3500 all day and Im only in the Kitchen 5200 rpm for about 10-20 seconds at a time and not often.
What do you Guys think?????
Justin

Brad Penn 20/50 hands down

I run mine the same way you do. I have put the pins to the firewall once this year so far to shake an annoying ass Jetskier. I run 20W50 Valvoline VR Racing. I am sure to always get the oil up to about 220 on the way back to the ramp to boil off any condensation.....

I just changed my oil, and tried Brad Penn 20W50 for the first time.
I have been hearing good things about it for years.

I was less than impressed with Brad Penn oil.

http://www.offshoreonly.com/forums/g...penn-oils.html

VR1 20/50 here.

Same for me VR1

Kendall 20-50

http://www.conocophillipslubricants....dall+Motor+Oil