Synthetic oil for 4-strokes?

Capt Al

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Jul 9, 2001
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After breking in a new 50hp 4-stroke with conventional oil would it be wrong to switch to synthetic oil after first oil change?<br />Pros and cons of synthetics?
 

JB

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Re: Synthetic oil for 4-strokes?

Y'know, Capt. Al, I am wondering the same thing. My Suzi 70 will be done with break-in soon, and if Suzi okays it I am going to put Mobil 1 in it like all of my other 4 stroke machines. I need to get Suzi's okay because I see some oil advertized as "4 stroke outboard oil". Among the zillion things I don't know may be a reason why we need to use a special formula.<br /><br />Red sky at night. . . <br />JB
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Walter

Senior Chief Petty Officer
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Re: Synthetic oil for 4-strokes?

Definitely check with your manufacturer fellas...you don't wanna risk voiding your warranty.<br /><br />Walt
 

hondon

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Re: Synthetic oil for 4-strokes?

Here we go guys. Honda does not rec. synthetics but only because of the change interval reccomendation and in the environment we are using these things in it would not be wise to not change engine oil yearly if only to check for water intrusion.With that interval it is hardly worth the extra expense.
 

alpapale

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Re: Synthetic oil for 4-strokes?

One thing everybody forgets when considering synthetic oil is that it offers superior protection within and well outside the normal operating temperatures of boat engines. So you would think that since your change interval is still the same (due to warrantee requirements, etc.) then why spend the extra bucks? Well, just suck-up some marine growth and over overheat your engine once, and ten years of the money you saved with the cheeper oil is gone. Conventional oil turns to sluge when engines overheat, synthetics do not. What's that peace of mind worth?<br /><br />Synthetic oil also just might get you started with a weak battery on a cold day, and maybe, just maybe you might even squeeze a few more minutes out of a tank of gas. <br />With prices as they are, maybe you'll get back some or all of the additional money you forked out for the synthetic stuff in the first place!
 

manowar

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124
Re: Synthetic oil for 4-strokes?

with so many dealers saying no and some yes thats hard to answer mine says no not ever have a 1999 120 Force I am not sure what motors use it if at all works great in my Silverado!
 

hondon

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Re: Synthetic oil for 4-strokes?

Bottom line here is anything that meets or exceeds the API or SAE standard reccomendations for your engine and your probably good to go.
 

alpapale

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Re: Synthetic oil for 4-strokes?

API or SAE standards are great for normal operation. They don't consider an overheated condition, weak battery or gas mileage.
 

clanton

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Re: Synthetic oil for 4-strokes?

I like to use Mazola in my motor, if the motor blows, just kick back and smell the popcorn.
 

JB

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Re: Synthetic oil for 4-strokes?

Get Clanton around a 4 stroke thread and he starts smokin' them jalapenos again.
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hondon

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Re: Synthetic oil for 4-strokes?

AP .Are you saying these oils do not meet those standards?iI Believe they are quite beyond them.
 

JB

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Re: Synthetic oil for 4-strokes?

Howdy, Hondon. I read AP's post as saying the same thing you say: Synthetics cover situations that recommended petro-oils don't.<br /><br />From my Suzi dealer: "We have no objection to you using Mobil 1, but it's so much more expensive we don't think it is worth using, because we don't want you to extend the oil change cycle."<br /><br />Hmmm. If I change the oil twice a year, that's about. . . well, let's say $5 extra per oil change. Ten bux a year to get insurance against losing my engine to unusual abuse or problems, and probably get improved fuel usage, too.<br /><br />I'll take it!<br /><br />Red sky at night. . . <br />JB
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alpapale

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Re: Synthetic oil for 4-strokes?

YOU'RE RIGHT ON THE MONEY J.B.! FINALLY SOMEBODY UNDERSTANDS. SURE, MOST ANY OIL FOR SALE TODAY MEETS ONE STANDARD OR ANOTHER. BUT FOR A FEW BUCKS MORE THE EXTRA PROTECTION IS WORTH IT BUYING THE SYNTHETIC IN MY OPINION. I USED TO USE TWO-STROKE SYNTHETIC IN MY OLD BOAT! I'M AN ENGINEER AND WORK WITH OTHER ENGINEERS, ONE WHO BUILDS AND RACES CARS. HE HAS LOST COOLANT DURING A RACE AND THOUGHT HE FRIED A VERY EXPENSIVE MOTOR, BUT WAS AMAZED AT THE FACT THAT THE OIL PROTECTED IT! WHEN HE TORE IT DOWN, THE PARTS LOOKED NEW, NO VARNISH, CARBON OR SOOT ANYWHERE. ALSO, MOST HIGH END CARS NOW USE SYNTHETICS AS THE BASE OIL. JAGUAR, PORSCHE, AND BMW TO NAME A FEW. MILITARY VEHICLES, AIRCRAFT AND TANKS HAVE ALSO BEEN USING THEM FOR YEARS. WHY?<br /><br />SYNTHETICS ALSO HAVE A MUCH BROADER VISCOSITY RANGE. THEY’RE RATED LIKE CONVENTIONAL OILS, (I.E. 5W-50) BUT ONLY BECAUSE THE STANDARD REQUIRES A MEASUREMENT AT TWO DIFFERENT TEMPERATURES. KEEPING IT SIMPLE, THIS MEANS A 5W-50 OIL HAS A VISCOSITY LIKE A STANDARD 5W OIL WHEN IT'S "COLD" AND A VISCOSITY LIKE A 50W WHEN ITS HOT. SINGLE VISCOSITY OILS ARE HEAVY AND THICK COLD, BUT THIN OUT CONSIDERABLY HOT. A SYNTHETIC OIL EVEN GOES FAR BEYOND CONVENTIONAL MULTI-VISCOSITY OILS, THEY POUR AT FORTY BELOW, AND DON'T TURN TO GEL AND CARBONIZE AT HIGH TEMPERATURES. <br /><br />CHEAP INSURANCE FOR ME! LIKE YOU SAID J.B., IT'S BETTER THAN BEING CHEAP WHEN BUYING OIL THAT YOU'RE ONLY GOING TO CHANGE TWO OR THREE TIMES A YEAR!<br /><br />HAPPY BOATING!
 

ahsah

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Jul 17, 2001
Messages
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Re: Synthetic oil for 4-strokes?

Did any of you catch the Consumers Reports article on engine oil a couple years ago?<br /><br />It was really great, they took 30? NYC taxi's (you and I both know NYC taxi drivers are probably much worse drivers we are) and tore the engines down and rebuilt them. Then they miked all the wear spots on the parts before reassembly. <br /><br />They put a couple on every major mfgr's oil, several on synthetics and some on additive's like slick 50 and such. <br /><br />CR changed the oil at the recommended intervals, making sure that all vehicles received the correct oil that had been assigned to it and that they topped it off with the same stuff between changes. Seems like they even had a coulple that didn't receive regular interval oil changes. <br /><br />After 30 -50K miles (can't remember exactly) they tore all the engines down and miked them again for wear to compare the original readings.<br /><br />Bottom line no difference at all. CR said buy an oil rated for gas engines and get the right viscosity, change it according to your manual. But buy whatever is on sale because it doesn't matter the oil isn't broken down at the recommended interval. It especially doesn't matter if you buy a vehicle and then trade it when it gets 60-70K miles on it. <br /><br />I know boat motors are different, don't think I'll go down to the Tractor Store for cheap oil for my boat engine. I'll put a better grade of oil in there and Synthetics' properties makes sense to me. <br /><br />I have to go to the library, I'll try to get you all the Month/Year of the article.<br /><br />Cap'n Steve
 

hondon

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Re: Synthetic oil for 4-strokes?

Beleive me guys .I not argueing against the use of these products.The reason manufacturers are not falling all over themslves reccomending them is that a few morons out there will let whats printed on that bottle of oil supercede any regular mainenance.We all know what that leads to.
 

JB

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Re: Synthetic oil for 4-strokes?

Point well made, Hondon. If superior lube properties, heat tolerance and retention of lube qualities well beyond recommended change cycles lures some tyro into neglecting routine TLC you end up with more damage than good.<br /><br />If I had treated my wife nearly as well as I treat my machines I would still be married. Unfortunately, too many boaters neglect their machines as badly as they do their wives. Bad news; boats and motors are far less forgiviing than wives.<br /><br />Red sky at night. . . . <br />JB
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Dunk

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Feb 11, 2001
Messages
127
Re: Synthetic oil for 4-strokes?

This might be point of interest that no one has covered.<br /><br /> 4 stroke outboards are a new thought. Yes, I agree that most oils meet or exceed manuf for running engines, but now we are talking about 4 strokes that need winterized.<br /><br /> Two years I bought a 1949 50hp Evinrude 4 cylinder Big Four from a guy in Alberta Canada. Over the course of the year we've been talking and I mentioned I was using some Amsoil 100 to 1 in the Big4 at 32 to 1 instead of 16 to 1 with OMC oil. He said thats no problem, but don't put her away for the season without running some dino oil through her. He went on to say that he and other old outboard guys have found that Synthetics seem to evaporate over the winter lay up and engines were rusting up. Now I'm sure winter in Alberta is longer than most , but they don't have rusting problems with regular oils.<br /><br /> If this is true and I've never heard of anyone testing synthetics for this, it might be a good idea to store your 4 stroke outboard with regular oil in it.
 

alpapale

Seaman Apprentice
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Jul 17, 2001
Messages
36
Re: Synthetic oil for 4-strokes?

Good point Dunk, something to look into for sure!
 

alpapale

Seaman Apprentice
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Jul 17, 2001
Messages
36
Re: Synthetic oil for 4-strokes?

Another question, "Is there any difference between 4 stroke outboard or 4 stroke I/O's as far as storage/winterizing and general maintance" ?
 

Walter

Senior Chief Petty Officer
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Jul 3, 2001
Messages
787
Re: Synthetic oil for 4-strokes?

I don't know just what's recommended for winterizing a 4S outboard, but getting my MerCruiser Type 1/350 ready for hibernation requires draining the the water out of the block & exhaust manifolds etc...and refilling with anti-freeze. It's also recommended to fog the engine... <br />I/O rigs equipped with closed cooling have it a bit easier in that the engine block is always maintained with anti-freeze and the chance of freeze damage occurring is minimal.<br /><br />I'd be willing to bet winterizing a 4S outboard isn't much more than a lube change and engine fog. Hopefully, the cooling system is self draining and requires no special winter maintenance. <br /><br />Walt
 
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