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motor oil???

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BEAR View Drop Down
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    Posted: 15 June 2017 at 02:05
So many new oils for engines.

so how I bought 5 quarts (5W-40W) of "Diesel Motor Oil",
Mobil. And without noticing, put it in the crankcase of
my gasoline boat engine.

Do you think it is OK?????
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lizard View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote lizard Quote  Post ReplyReply Direct Link To This Post Posted: 15 June 2017 at 02:33


Does the label on the bottle indicate if it can be used for both gas and diesel engines?
Trigger Control is knowing when not to pull it.
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BEAR View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote BEAR Quote  Post ReplyReply Direct Link To This Post Posted: 15 June 2017 at 02:40
nope.
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RobertMT View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote RobertMT Quote  Post ReplyReply Direct Link To This Post Posted: 15 June 2017 at 05:23
Lost the long post, short version.

$20 of oil VS boat engine, save the drained oil for lawnmower, if you want.
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d4570 View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote d4570 Quote  Post ReplyReply Direct Link To This Post Posted: 15 June 2017 at 05:31
If there is no warrant problems and the viscosity is right it's still oil.
Some extra additives maybe but oil is oil.
All modern automotive oils, including Diesel will be adequate. Run it this season and put in the right stuff the next time...
JUST MY OPINION
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Post Options Post Options   Thanks (0) Thanks(0)   Quote deaddog Quote  Post ReplyReply Direct Link To This Post Posted: 15 June 2017 at 05:48

The extra detergents will emulsify the sulfur particulates in your oil.

The consequences of this chemical alchemy may just keep you up at
night?



Not me.

DD

Edited by deaddog
Endeavor to persevere.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote d4570 Quote  Post ReplyReply Direct Link To This Post Posted: 15 June 2017 at 08:14
Bear I did a Google and came up with this;
"It is safe to use a diesel oil in your gasoline engine, provided the diesel oil meets the appropriate specifications and viscosity requirements of your engine. For example, if your gas engine calls for a motor oil that meets the API SN specification, you can safely use a diesel oil of the correct viscosity that meets the API SN spec. For the typical gasoline application, however, a diesel oil isn’t required and the more appropriate choice is a quality gasoline motor oil for both performance and value.

Pay attention to oil specifications

The American Petroleum Institute (API) publishes its “C” category of specification for diesel oil (currently CJ-4) and its “S” category for gasoline motor oil (currently SN). It’s common for today’s diesel engine oils to carry both the API CJ-4 and API SN specifications. Though they’re truly designed for diesel applications, they can be used in gasoline applications for motorists who want to use one oil in all applications. If the diesel oil carries both specs, the oil is safe to use in diesel and gasoline applications. If the diesel oil does not carry the “S” category, AMSOIL strongly recommends against using it in gasoline applications.

The correct oil formlation for the application

In the past, motorists may have been told diesel oils were tougher than passenger car oils for a number of reasons, including higher viscosity, improved corrosion protection, higher Total Base Number and more. Diesel oils are often thought to be formulated with special components not available in gasoline motor oils, such as more robust detergency additives to handle the soot inherent to diesel engines. In some motorists’ minds, diesel oils are still analogous to better protection.

While that may have been true in the past, modern oils are formulated for their intended applications. While both diesel and gasoline oils contain many of the same additives to guard against wear, corrosion, foaming and more, they also contain additives designed to manage the byproducts of combustion. Some of those byproducts change, depending on whether the engine runs on gasoline or diesel fuel. If your vehicle uses a gasoline engine, it’s best to use an oil that contains the correct additives to handle the byproducts of gasoline combustion. The same holds if you’re operating a diesel engine.

When to favor diesel oil over gasoline motor oil

If your gasoline engine is heavily modified to put out more horsepower, using a diesel oil can be beneficial. It’s likely modified engines will need a higher viscosity to withstand the increased stress. You can turn to diesel engine oils for those needs or you might want to consider a racing oil, depending on your engine modifications and lubrication requirements.

Many times the engine builder will help provide insight as to what success they have found. Outside of that, if you have a bone-stock gasoline-powered application it’s best to stick with a gasoline motor oil. They are designed for that type of application and have the components required to manage that engine"

Its from the AMSOIL sight .





https://www.amsoil.com/newsstand/diesel-oils/articles/can-i- use-diesel-oil-in-my-gas-engine/

D




Edited by d4570
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Post Options Post Options   Thanks (0) Thanks(0)   Quote RobertMT Quote  Post ReplyReply Direct Link To This Post Posted: 15 June 2017 at 08:55
D's post has most of info, my lost longer post had. The new low sulfur diesel fuel, is different from old higher sulfur style, so current oil, has additives to help protect older diesels, designed for higher sulfur fuel, which protected turbo bearings. I doubt these would be harmful to gas engines, but I know from having to rebuild/replace injector pumps and injectors, from new diesel fuel eating O-rings, similar to how E10 gas, is hard on older gas systems.

Years ago, I ran alcohol fuel drag boat, you had to use different gaskets, 0-rings, valves, and oil. Alcohol would either eat or rust it otherwise. It's more hydroscopic than diesel, but diesel tends to cause similar issues.

Again you could probably get by fine using it, but is it worth the risk of damage, which is more likely in older engines, than new?
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Post Options Post Options   Thanks (0) Thanks(0)   Quote jsgbearpaws1 Quote  Post ReplyReply Direct Link To This Post Posted: 15 June 2017 at 10:52
Originally posted by BEAR BEAR wrote:

So many new oils for engines.

so how I bought 5 quarts (5W-40W) of "Diesel Motor Oil",
Mobil. And without noticing, put it in the crankcase of
my gasoline boat engine.

Do you think it is OK?????

If it's an outboard or performance motor, no worries. Dumbed down inboard? Swap it out.

Mobil one diesel or otherwise works in gas motors of the performance type without issues. Same goes for Rotella. Many of the guys over on the Duc site use them as they change the oils very often in track bikes.....like every track day! I doubt your engine is going to get anywhere near a track bikes abuse in any given season
...oh yeah! thats gonna hurt!
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Post Options Post Options   Thanks (0) Thanks(0)   Quote RobertMT Quote  Post ReplyReply Direct Link To This Post Posted: 15 June 2017 at 11:21
Since Bear's "new" boat is 28yrs old and likely not designed for E10 gas, I'd be concerned about gaskets and seals, breaking down, more than bearings and rings.

In 70s, I used to run AV gas, on the street, before they cracked down. You could run some pretty high compression, without knocks, but it was hard on exhaust valves.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Wing master Quote  Post ReplyReply Direct Link To This Post Posted: 15 June 2017 at 16:29
Back when I was a diesel mechanic, I could get diesel oil
real cheap. Real real cheap.

I ran it in 2 different 350 Chevrolets for years I never
had a problem.

I figured the diesel oil had more deturgents in it. I
expected to see oil leaks or maybe rings not seating but
never did.

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Post Options Post Options   Thanks (0) Thanks(0)   Quote stinky Quote  Post ReplyReply Direct Link To This Post Posted: 16 June 2017 at 04:04
What sort of motor is in ur boat?

I run a diesel oil in several of my
vehicles as it is believed to be better
for preventing wear on a motor w.a
standard flat lifter (non-roller).
John 14:6
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Post Options Post Options   Thanks (0) Thanks(0)   Quote BEAR Quote  Post ReplyReply Direct Link To This Post Posted: 20 June 2017 at 04:18
I run std 5-40W motor oil, the old high detergent
stuff.

This has SN rating so I'll run it this summer.

thanks guys.
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