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General Mark Twain Discussion / Re: Bow Cushions
« Last post by New2Me78 on July 12, 2016, 06:14:41 PM »
I think attaching the bow cushions this way is going to work. Finally starting to install parts instead of removing. I took your advice & cut out underneath where the front cushion goes.
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General Mark Twain Discussion / Re: oil preference
« Last post by New2Me78 on July 12, 2016, 06:00:15 PM »
Yeah especially in the Midwest it's really hard to find gas without at least 10% ethanol. These old engines & carbs just do not like it. I really hope these gas prices stay where there at right now so I can afford to fill er' up with the 91 or 93 octane.
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General Mark Twain Discussion / Re: oil preference
« Last post by Haulnazz15 on July 11, 2016, 10:54:39 AM »
Eh, six of one - half dozen of the other.  Many people just want to have fresh oil coating the internals prior to putting it away for the winter.  Winter air is typically extremely dry in terms of moisture content anyway, so I doubt the oil absorbs much of anything especially at lower temps. 

As far as using synthetic, there's no reason to use it or not use it for most boaters (assuming it's not a modern engine specifying its use).  If it helps your peace of mind, go for it.  The only fluid issue that likely makes more of a difference is fuel, and I'd just try to always use zero-ethanol gasoline if you can, especially for storage over the winter as E10 will absorb more water, dry up rubber carb internals, and give lower performance unless you high a really high-compression engine.
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General Mark Twain Discussion / Re: oil preference
« Last post by New2Me78 on July 10, 2016, 07:28:40 PM »
I was just thinking it shouldn't break down as fast as regular oil. Figuring in that most days I will be running the boat it will be hot out & will be at higher RPM's for extended amounts of time. Might be a waste of money but like you said should only need to change oil once a year so it's worth the few extra bucks to me. This brings me to another question... I have read in several different places that you should change oil at the end of the season not the beginning. I would think it would be the other way around. Wouldn't you want to get out any moisture that the oil has attracted over the winter?
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General Mark Twain Discussion / Re: oil preference
« Last post by Haulnazz15 on July 08, 2016, 10:07:39 AM »
I run Castrol GTX (so regular), but that's just because we always have.  I honestly don't think there's much advantage to running a synthetic for most boaters with non-modern engines.  The main advantage of a synthetic is to extend the time between oil changes in terms of mileage/operating time.  When most boats see 20-30hrs of run time each season between oil changes, it's hardly enough to warranty using a synthetic oil.  Doing so would be like changing the oil in your personal vehicle every 1,000 miles.  However, I doubt there's any harm in running synthetic if you so desire.  I run Mobil 1 full synthetic in my vehicles for over a decade and haven't seen any ill-effects.
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General Mark Twain Discussion / Re: oil preference
« Last post by New2Me78 on July 07, 2016, 05:18:46 PM »
Is that regular oil or synthetic? After mine is broken in I think I will switch to synthetic.
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General Mark Twain Discussion / Re: oil preference
« Last post by Haulnazz15 on July 06, 2016, 06:32:30 PM »
Eh, I run SAE 30 weight in mine (small block Ford).  10W-30 works, too, if you prefer.  If you run in high-90's, 100-degree temps all the time maybe go to 10w-40.  I doubt you'd really need to go heavier than that.  I run Wix filters on everything I own.
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General Mark Twain Discussion / oil preference
« Last post by Barry on July 06, 2016, 04:11:42 PM »
What is the preferred oil to use in my 165 I/O ??
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General Mark Twain Discussion / Re: My new Mark
« Last post by Haulnazz15 on July 06, 2016, 08:57:32 AM »
Welcome!  Not sure where you're from, but they were a fairly popular brand in the plains states.  Lots of them in OK,KS,MO,IL,AR,TX due to being so close to where they were manufactured, ran from the mid-1960s all the way to the early 90s.  Post some pictures to show us what you have!
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General Mark Twain Discussion / My new Mark
« Last post by ChemKitty on July 04, 2016, 08:09:55 PM »
Thank you for add. I'm looking forward to finding out more about my new boat. Mystery history is right. I'd never heard of this brand before, but I'm excited at the prospect of tooling around with this gem.
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