Recent Topics
Does lower ZDDP protect less or for shorter time?
by OceanRuns
08/28/15 11:42 AM
Can quality of fresh motor oil be judged by smell?
by contrarian
08/28/15 11:31 AM
EIS Master Cylinder ?
by edge10
08/28/15 10:44 AM
Home A/C repaiman sniffing refrigerant for smell
by Mr Nice
08/28/15 10:36 AM
Valve Cover Off - 07 Kia Optima 2.4l
by bigblumer
08/28/15 10:31 AM
Purolator is still listening- Engineering report
by HangFire
08/28/15 10:08 AM
ammo design and performance criteria
by dnewton3
08/28/15 08:31 AM
Looking into sporty / grand tourer cars
by thr_wedge
08/28/15 08:26 AM
Bottled water on track to outsell soda by 2017
by Mr Nice
08/28/15 08:21 AM
dodge caliber - motor oil
by foresthawk
08/28/15 08:09 AM
When's the best time of year to buy a Chevy Truck?
by horse123
08/28/15 08:01 AM
Pennzoil euro av
by JHogan
08/28/15 07:57 AM
Newest Members
Isentropic, retroguy, Ozchemist, Imad, LockportHenry
55172 Registered Users
Who's Online
85 registered (4wheeldog, 3311, 3Phase, 00Max00, 77GrandPrix, 97f150, 6 invisible), 1730 Guests and 158 Spiders online.
Key: Admin, Global Mod, Mod
Forum Stats
55172 Members
66 Forums
236604 Topics
3812098 Posts

Max Online: 2862 @ 07/07/14 03:10 PM
Donate to BITOG
Topic Options
#971553 - 08/21/07 10:02 PM Amsoil 4 - Stroke Marine
MacBarry Offline


Registered: 08/18/07
Posts: 2
Loc: Ca.
This is my first post and I have a few questions that you guys can help me with. I am the process of having a new 5.7 Vortec Marine 320 hp carb version installed in my boat. Bolted to a Cobra outdrive. A engine oil cooler has been installed as well.

1. The shop that is doing the install states I should not use synthetic oil during the break in period. As the rings may not seat. But I know the new Corvettes come with synthetic from the factory. Is this a problem?

2. Oil recommendation from the Marine engine company is.
Ambient temp above 50F - API SAE 15-40 SM
Ambient temp below 50F - API SAE 5-30 SM

3. I ordered a case of Amsoil-4-Stroke Marine Synthetic [WCF] SAE 10W-40. I notice it is not SM rated but on the Amsoil site it shows it is ok to use in an I/O. Is this the correct oil to use?

Thanks four comments in advance.

Top
#971554 - 08/21/07 11:09 PM Re: Amsoil 4 - Stroke Marine [Re: MacBarry]
Pablo Offline


Registered: 10/28/02
Posts: 46858
Loc: Duvall WA - Pacific NW USA
1) Don't use a synthetic from the first start is good advice, but it has nothing to do with ring sealing and everything to do with rinsing out the new engine and lines and the expense of the oil.

2 and 3) The 10W-40 will work fine. You don't need an API SM for that application.

Top