oil

[bigpapasean]

New be gust wondering what brand weight of oil would you suggest running in a mild built 454.

[Hotcrusader76]

I think you can get away with some Kendal 20W50

[bigpapasean]

The other thing I was wondering about was how often to change it

[Jet City]

15w40 HDEO (such as Chevron Delo), 20w50 or straight 40wt are all reasonable choices for the application, I use 40wt Kendall (less thinning than a multi) for my boat with Napa Gold filters (by Wix). For more details on oil check out www.bobistheoilguy.com. I think anything under 40 hrs would be safe for duration, I change out at 20hrs or so (oils cheap). If your really fussy, you can do UOA's (used oil analysis) to determine best change interval.

[HammerDown]

Another Kendall GT40 user here.

[miketsouth]

Originally posted by HammerDown
Another Kendall GT40 user here.
thats ALL i used in my FWC merc470 for 13 years. 5000 or more hours nothing but WOT skiing. Still runs strong.
i use mobil 1 15-50 in my jetboat though.

[Duane HTP]

Break it in on Kendall GT-1 20W-50.
Then run it on Mobil 1 15W-50. The Mobil 1 will carry 10 lbs. more oil pressure on a hot day.
Straight 40W works great on a warm engine, but you need the 20W characteristic to get oil to the needed places quicker on start up.

[Hollis]

Seloc Publications Jet drive manual recommends straight 40.

[LakesOnly]

Originally posted by Duane HTP
Break it in on Kendall GT-1 20W-50.
Then run it on Mobil 1 15W-50. The Mobil 1 will carry 10 lbs. more oil pressure on a hot day.
Straight 40W works great on a warm engine, but you need the 20W characteristic to get oil to the needed places quicker on start up.
I'm with Duane on this one...
Break the motor in with a good quality petroleum-based lubricant, such as Kendall. Then switch to a high-quality synthetic base stock lubricant.
Due to the harsh conditions subjected to a V8 in a marine application, I recommend oil/filter changes every 25 hours of running time. (Petroleum oil motor break-in: change oil/filter at 1-hour, 10 hours, then 20 hours).
LO

[sanger mike]

I used kenndal GT-1 50W last year in my LS7. on problemes:D