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https://www.smwebhead.com/phpBB3/viewtopic.php?f=11&t=15157		 Page 3 of 3
Author:  rgoals2win [ Wed Mar 22, 2017 1:58 am ]
Post subject:  Re: It's gone
I use Mercury or QuickSilver filters. Aways wondered, frankly, what the difference is since Mercury owns QuickSilver brand, as far as I know.

Seemed like the thing to do since I was putting in their 25W-40 anyway.

While I am terribly curious as to whether or not marine oils are different from automotive, I highly doubt that filters are different. Just convenient to buy at the same time.
Author:  LouC [ Wed Mar 22, 2017 6:07 am ]
Post subject:  Re: It's gone
Sierra says the anti corrosion process is different (this is also true for the fuel filters) and in a salt water environment this is a big deal. I've never had a marine filter rust in 15 years of salt water moorage & use.
Author:  Technologic80 [ Wed Mar 22, 2017 8:25 pm ]
Post subject:  Re: It's gone
deafwish wrote:
Technologic80 wrote:
This year I am using..... <gasp> full synthetic Shell Rotella T6 5w/40 in my twin 4.3 engines :shock: :)


I'd love to see an oil analysis report targeting viscosity if you're pouring a 5w40 in there! :shock:
Oils with a large viscosity range use a large amount of VI Improvers, which shear at a faster rate.
This is why Mercruiser still use their 25w40.
I'd personally never use anything thinner than a 15w40 in any marine application.
It's still >30c down in Australia & I'm currently using a high ZDDP, 20w60! 8)


I researched it ad nauseum, spent a lot of time reading on Bob is the Oil Guy forums...many UOA's showing it is extremely shear resistant. A lot of people using it in their diesel engines, hot rods, and boat engines because of this. Normally I wouldn't go lower than a 10w40 (exception: my one run with HD diesel 10w30)...
Author:  rgoals2win [ Fri Mar 24, 2017 1:05 am ]
Post subject:  Re: It's gone
LouC wrote:
Sierra says the anti corrosion process is different (this is also true for the fuel filters) and in a salt water environment this is a big deal. I've never had a marine filter rust in 15 years of salt water moorage & use.


Funny thing is, I was looking up filters to buy last night for the boat and saw a similar line to what you just noted, Lou. Might as well be conservative and use the corrosion resistant design. Not enough savings to worry about going cheaper.

Thank you, Lou...!

Bob
Author:  LouC [ Fri Mar 24, 2017 6:26 am ]
Post subject:  Re: It's gone
You're welcome!
In a fresh water area with a boat kept on the traiker not so much of a concern but a moored boat like mine in salt water with a bit of water always in the bilge you always need to keep ahead of corrosion...
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