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Synthetic oil ?

Old 06-13-2019, 05:17 AM
  #21  
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I mix it up a bit, I use Castrol Syntek in my Hondas for the uppers and Amsoil synthetic 75-90 gear lube for the lowers. After the first lower unit oil change I noticed the oil not as dark. 110 +/- hrs later and another lower unit change, it looked as good as when it went in...I am now changing at 200 hrs.

I have used Castrol products forever...since I was a kid and owned an MGA....and the mechanic swore me to an oath to only use Castrol 50 in it...yeah, they had some big clearances...

I have pretty much stayed with it over the years. Occasionally it has been hard to find, and have used Mobil 1 as a backup....
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Old 06-13-2019, 05:56 AM
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Originally Posted by mfix View Post
I order Amsoil on line. Now I don't have to chase down a sales person.
I run it in at 100:1 in the old Johnson on my whaler while idling around and fishing the back parts of inlets.
It almost eliminates any smoke that lingers when there's no breeze. If I know I'm going to run higher rpm's,
I mix it 75 or 50 to 1.
I understand but I believe the issue here is four stroke oil, not two stroke oil.
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Old 06-13-2019, 06:07 AM
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why does my outboard oil have to be "marine rated"(FCW), but the oil for my CAT diesels doesn't?
They're both used in saltwater, on boats, both four stroke.

Use synthetic or don't use synthetic. Use FCW oil or don't use FCW oil.
I honestly don't think it makes the difference between an engine going kaboom or not. Nor does it really dictate just how many hours you'll get out of the engine.
Use Mobil 1, use Amsoil, or use the house brand at Walmart. You won't ever know the difference.
Change the oil as needed, change the filters as needed, use the right viscosity, and go use the damn boat. Or car. Or truck. Or motorcycle.
"I've only used synthetic since day one and I've had zero problems, so synthetic is best."
Use regular dino oil since day one and you'll have the same results.
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Old 06-13-2019, 06:46 AM
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I realize I opened up a can of worms (lets go fishin'!) by starting this post.Plenty of information and opinions already out there.

We all know how important is is to keep engines well lubricated, and everyone has their own preferences. Dino oil, synthetic oil, viscosities,frequency of changing......its all personal preference and experiences.

Let's move on and start making plans for your next trip and maybe dream about a larger,more powerful boat with great features !
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Old 06-13-2019, 06:51 AM
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Stick with the manufactures
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Old 06-13-2019, 06:52 AM
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I talked to a guy that works on Hondas. Said one of his commerical users has 18,000 hours on some motors that run all day everyday (mostly idle). 1000-2000 hour is nothing on modern engines, and definitely not a bragging point. Sitting unused is more damaging to the engines than being used.

Modern synthetics are amazing oils and reduce wear to almost nothing. Why anybody would not use them is beyond me.
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Old 06-13-2019, 06:54 AM
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Originally Posted by OrbitExpress View Post
Stick with the manufactures
the manufactures (sic) what? suggested specifications or brand of oil?
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Old 06-13-2019, 06:56 AM
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No can of worms as far as I'm concerned. Many people on this forum are smarter than me and I like to learn factual information from them.
Just how important is FCW, I don't know. Synthetic and "making oil", I don't know. So you go fishin, I want to hopefully learn something.
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Old 06-13-2019, 08:01 PM
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Originally Posted by coores14 View Post
why does my outboard oil have to be "marine rated"(FCW), but the oil for my CAT diesels doesn't?
They're both used in saltwater, on boats, both four stroke.
You broke the code in your question.

One power plant is used on an outboard motor. The other power plant is not.

But in the scheme of things it probably won't amount to a rats arse which oil is used.
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Old 06-14-2019, 03:48 AM
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My Tohatsu will make oil if I run synthetic oil but doesnít if I use conventional, itís the only engine I have ever owned that does this. I had asked the dealer about it a quite a while back and he said synthetic doesnít generate enough friction & heat to burn off the excess gasoline and the solution was to run conventional. Itís a testament to the anti-friction characteristics of synthetic oil I guess.
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Old 06-14-2019, 04:02 AM
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What ever type just put oil in the darn motor
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Old 06-14-2019, 04:26 AM
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Originally Posted by springerfever View Post
Guys, just curious.....with synthetic oils being used for most high-end trucks and cars....why is it not used in boats ? I have a 99 ML430 that I bought new and it now has over 407,000 miles on it with original engine. I attribute the longevity to the Mobil One 0W40 I've been using since day 1 with changes every 10,000 miles.

I know outboards generally stay in the 2000-6000 RPM range, and you would think the synthetics would be ideal for this environment. What gives ?
Mobil One is the very best for any engine I would think. I now have 150,000 on my Ford Explorer with Mobil One every 5000 miles. I intend to use it in my new Mercury at the first oil change.
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Old 06-14-2019, 04:29 AM
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Originally Posted by fireisland1 View Post
I’m in the engine business and I have yet to see an engine go kaboom from the wrong oil. That said, i’m Not sure why the general public would not just use what the manufacturer recommends. Just so you sleep better.
Simply because less heat means longer lasting parts in your engine. Doesn't that make sense to you?
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Old 06-14-2019, 04:32 AM
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I watch this guy here, he tests them all, This is just 1 clip but basically goes through all of them....
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Old 06-14-2019, 04:37 AM
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Originally Posted by triumphrick View Post
I mix it up a bit, I use Castrol Syntek in my Hondas for the uppers and Amsoil synthetic 75-90 gear lube for the lowers. After the first lower unit oil change I noticed the oil not as dark. 110 +/- hrs later and another lower unit change, it looked as good as when it went in...I am now changing at 200 hrs.

I have used Castrol products forever...since I was a kid and owned an MGA....and the mechanic swore me to an oath to only use Castrol 50 in it...yeah, they had some big clearances...

I have pretty much stayed with it over the years. Occasionally it has been hard to find, and have used Mobil 1 as a backup....
I was always told that Castrol and Pennsylvania oils were extracted from Bituminous coal and not Anthracite. Bituminous is soft coal and therefore the extraction causes more soot and burning when used in engines. I wonder if this must be wrong when you think about the Indy 500 and racing but don't know for sure. The racing engines don't last long so not sure longevity is considered when running those engines. I used to have a Jeep and ran Castrol in it from new. I remember having problems and when one of the valve covers was removed it was packed with gunk. The mechanic told me it was from using Castrol.
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Old 06-14-2019, 04:53 AM
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Originally Posted by Jassman View Post
I watch this guy here, he tests them all, This is just 1 clip but basically goes through all of them....https://www.youtube.com/watch?v=E2zS8MyvJxU
I learned a lot here. Most notably how to waste 12 minutes.
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Old 06-14-2019, 05:11 AM
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Originally Posted by tarpononecharter View Post
I learned a lot here. Most notably how to waste 12 minutes.
If you like to learn more...like you state...than take another hour or so and watch all the videos. They are good unscientific tests on lubricity and other issues related to oil. Just another view point.
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Old 06-14-2019, 05:16 AM
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When was the last time you saw an engine damaged from "the wrong oil"???
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Old 06-14-2019, 06:07 AM
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Originally Posted by billinstuart View Post
When was the last time you saw an engine damaged from "the wrong oil"???

I agree Never. I do believe some perform better in areas, and some in different environments, but the differences are negligible...and then you get in your mind which oil is the best for what ever the reason. I have been using Castrol cause that's the place where they do all of our trucks maintenance. I see from reading here that might be an issue with build up....who knows, all the truck have over 250k and all is good.
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Old 06-14-2019, 09:35 AM
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Fwiw

Honda bf130
honda oil first several years.
then onto Walmart 10-30, Castrol usually .
about 8-10 years in someone gave me a mess of synthetic.
the engine started leaking oil. ( Iíve also heard it said that Honda filters are so fine they would sift valuable Particles out of the synthetic oil. Probably bullshit but I surely didnít know)
stopped the synthetic. Leaking basically stoped . Coincidence, I donít know. I donít think so .
back to Walmart castrol 10-30.
i just sold the motor running perfectly with 15 years and over 4000 hours.
Your milage May vary.
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