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Old 08-16-2001, 11:41 AM
JLC JLC is offline
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I'm running Mobil 1 synthetic 0w30 in my 25 horse Kohler. According to SDWally this would be a good oil I suppose. It is thin at startup to give quick lubrication and has the viscosity of the standard 30 weight when warmed up. Additionally it is sythetic so it won't break down if it gets heated when you are really working the engine. Is this right?
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Old 08-16-2001, 02:22 PM
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Sammy Sammy is offline
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I think that the 15w40 is better than the 10w40.

The 10w40 needs more/larger plastic to work.

Fish, Are you the same Fish from the Garden Web Board ?
Quality Is Good !
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Old 08-16-2001, 06:30 PM
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Fish Fish is offline
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Location: Lawrenceburg, KY
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Yea, they were getting tired of me over there. I still pop in to
piss someone off, but Eric invited me, so I thought I would come
over here and start trouble.
For some reason the compound of 10w40 is real bad for
breakdown, I have read reports that all realize this. I always
recommend straight 30w unless there is a reason, I even run
it in my van. I have just seen too many engines desroyed by it
or I would not bother posting. Failures caused by this are
usually misdiagnosed, and since many engine manufacturers
used to recommend this oil, they will not be too forthcoming
to condemn this oil. But type motor oil, oil, or whatever into
a search engine and you can read reports on oil. You will find a
small reference to multi-viscosity breakdown particularly with
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Old 08-16-2001, 07:44 PM
John DiMartino John DiMartino is offline
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SAE 30 is the one to use,down to 32 degrees in air cooled motors.Below that,go to a 10w30,or 15w40 diesel oil.15w40 is good stufff,and pretty much can be used year round down to zero degrees,but I like to go thinner below 20 degrees.
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Last edited by John DiMartino; 08-16-2001 at 07:54 PM.
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Old 08-21-2001, 03:34 AM
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Vibe Ray Vibe Ray is offline
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Seriously though guys, is there a synthetic straight weight 30 or even 40 out there? All I see is 10W-30 in Mobil 1. And if the SAE 40 is thicker wouldn't that provide better protection? So why go with the SAE 30?
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Old 08-21-2001, 06:46 PM
HBFOXJr HBFOXJr is offline
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Mobil makes more than the X/30W in Mobil 1. A friend uses a 15/40 or probably 20/50 in a hot 454 in a speed boat. Might even make a series 3 for diesel.

The Rotella oil is a very high quality oil.

Years ago I switched to oil and grease from TRC - Texas Refinery Corporation. Everything lasted longer. Especially bearings and bushings with the #2 chassis grease.

I now buy equivalent product thru King Oil, Hagerstown Maryland. Both product lines are expensive but worth it.

Another friend sells Husquavarna racing bikes. On regular oil they require rebuild after every race and the bearings show wear. On Mobil 1 they go 2 races and they look like new upon tear down. They still rebuild after 2 races because they don't know how far they can really go.
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Old 08-21-2001, 11:18 PM
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Synthetic 5W-30 or 10W-30

All air cooled engines will run better, last longer and produce more power with synthetic oil. B&S (and ALL others) highly recommend the use of either 5W-30 or 10W-30 synthetic oil for all temperature ranges. NO OTHER OIL IS AS GOOD! Also, don't worry about "break-in" with dino oil. You can put synthetic in on the first start of the engine. The engine parts will mate just as well with synthetic as dino (probably better). There is only one thing about dino oil that is's cheaper!
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Old 08-21-2001, 11:39 PM
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Keith Keith is offline
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Originally posted by Vibe Ray
Does any brand make a fully synthetic SAE 30? I see 10w- 30, but not SAE 30 in synthetic.
Yes, Amsoil makes a SAE 30. I ran it in my gas Kubota for over 2000 hours. I switched to 10w-30 Mobil 1 because I could only get deals buying 4 gallons at a time. At that point we weren't using it that much.

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Old 08-22-2001, 05:46 PM
Wangel Wangel is offline
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Hey fish, what compound are you speaking of in 10w40 oil?

Remember the car manufacturers used 10w40 for about 20 years in cars without any problems, then shifting to 10w30, and now 5w30. The manufacturers engineers we should all agree would know the best oil for our engines.

For example: The new Honda tractors actually recommend 10w30 or 10w40 depending on the temperature. Whereas Tecumpseh states specifically DO NOT USE 10w40 oil. So which is it?

The best recommendation anyone can give is to read the manual that comes with your equipment and to follow it explicitly. Do not follow myths, wifestales, or statesments that start, "someone told me once". Otherwise YOU could be responsible for voiding someone warranty.
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Old 08-22-2001, 06:51 PM
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Fish Fish is offline
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I know oil is a hot topic among people. I typed in motor oil in
msn search engine and came up with this wives tale right off.
I can find other articles referring to multi-viscosity breakdown
if you wish, but I have seen many engines destroyed by it.
Look at paragraph 7 for the first reference.
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