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Old 06-05-2009, 10:17 PM   post #1 of 25
Erich.VonGeist
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Default using synthetic oil and premium (93octane) fuel....

Hi,
I was wondering if using synthetic oil and premium fuel (93 octane) would benefit the various engines used in John Deere riding mowers.
My wife and I have always used full synthetic high grade oil and 93 or better octane fuel in our cars and the engines seem to run better and last longer so I thought I would ask if this applied to the deere mowers.
Thanks,
Erich
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Old 06-05-2009, 10:36 PM   post #2 of 25
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Default Re: using synthetic oil and premium (93octane) fuel....

Sorry but unless you're running a high performance engine 93 isn't going to do
you much if any good. Very few cars on the road require 93 octane. Car and
Driver ran a test several years ago and the test showed that vehicles that were
set-up from the factory actually performed worse on 93. Nothing wrong with
running Synthethic oil.
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Old 06-05-2009, 10:39 PM   post #3 of 25
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Default Re: using synthetic oil and premium (93octane) fuel....

I agree with Grateful 11
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Old 06-05-2009, 11:43 PM   post #4 of 25
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Default Re: using synthetic oil and premium (93octane) fuel....

My old Snapper dealer told me once that one of the things in gas that 'goes old' is the Octane in it. He told me buy buying 93 I was giving myself some padding as the gas aged - his logic being 93 octane getting old to 87 is better then 87 getting old to 80.

I have no idea if he was right or not. I put Stabil in everything. I fill my gas container up 1/2 way, drop the Stabil in, and fill it up the rest of the way. So if he IS right, I'm not sure it even applies to me.

On the other hand, my JD is thirsty so I was wondering the same thing.
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Old 06-06-2009, 06:53 AM   post #5 of 25
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Default Re: using synthetic oil and premium (93octane) fuel....

Quote:
Originally Posted by Erich.VonGeist View Post
Hi,
I was wondering if using synthetic oil and premium fuel (93 octane) would benefit the various engines used in John Deere riding mowers.
My wife and I have always used full synthetic high grade oil and 93 or better octane fuel in our cars and the engines seem to run better and last longer so I thought I would ask if this applied to the deere mowers.
Thanks,
Erich

93 or BETTER??

You going down to the local airport and getting jet fuel??

Never seen higher than 93 octane east of the Mississippi and no car or mower needs it unless its a high compression motor either from the factory or after market built that way.

You're just wasting your $$ if your motor doesn't need the octane. We have to run 93 octane in our 'clown car' (wife just HAD to have a SMART FORTWO). Its not much bigger than our L130 because the little 3cyl is at 10:1 compression (They purposely did this for added performance)

Run the synthetics as long as everything is sealed good. (Put synthetic in an old car I had, leaked like a sieve, put in dyno oil, no leaks) and "mow on"..

Bank the extra cash for when you are OLD...... You'll need it.
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Old 06-06-2009, 09:27 AM   post #6 of 25
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Default Re: using synthetic oil and premium (93octane) fuel....

You have to match an engines compression ratio, and ignition curve, to the correct octane level of gas. I run a supercharger with 13 lbs of boost on one of my Mustangs, and only run 93 octane fuel or better. Sometimes I fill it with 100 octane when I go to the track. I do this because my compression ratio under boost will cause detination with anything less. A stock 9:1 motor only requires the lowest octane sold at the pump. I agree with Grateful. I use to race 1/4 mile short track in a FWD division, and always filled the car with 93 octane fuel. One day, while at the pump, I grabbed the wrong hose and filled up with 87. That night, I could tell the difference; the car pulled harder, and felt much more responsive. I ran with 87 octane ever since.
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Old 06-06-2009, 09:35 AM   post #7 of 25
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Default Re: using synthetic oil and premium (93octane) fuel....

And in my Passat turbo, if I run 87 instead of the recommended 93, my power and fuel economy decrease. Stick to what the engine was designed to use.
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Old 06-06-2009, 10:47 AM   post #8 of 25
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Default Re: using synthetic oil and premium (93octane) fuel....

Okay, regular 87 octane fuel. What about Deere Dino Oil vs. something like Mobil 1? My first oil change w/ the new X320 is happening this month ...
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Old 06-06-2009, 10:49 AM   post #9 of 25
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Default Re: using synthetic oil and premium (93octane) fuel....

Deere dino oil, if nothing else for warranty purposes.
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Old 06-06-2009, 11:49 AM   post #10 of 25
Erich.VonGeist
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Default Re: using synthetic oil and premium (93octane) fuel....

Hi,
Were getting some great responses on this thread.
I think I'll stick to 87 octane for my sx95 mower until we get more input on the octane decay theory. Fuel stabilizers? Never thought of that, but seeing how lawn mower fuel can sit up a while in the gas cans, I think it might be a good idea to explore.
Deere dino oil? I haven't heard of that, but I have only owned my little sx95 for a short while and this is the first riding mower we have owned. Always used a push mower before that, but now that my monster in law....I mean mother in law gave away her murray rider, 2 acres with a pusher was killing me.
My wife's 2000 750il 5.4l V12 requires 93 and BMW synthetic oil.
My VW Jetta Mk3 GLX 2.8 VR6 also requires 93 and I put mobil 1 0w40 full synthetic oil in it. All of our cars have been german so we have always ran 93 in them. I guess if we had an Opel though, it wouldn't need the 93.
Some of the gas stations around have had their premium rated at 94 or 95 octane. Just depends on the station.
Thanks for all the great info,
Erich
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Old 06-06-2009, 02:06 PM   post #11 of 25
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Default Re: using synthetic oil and premium (93octane) fuel....

Stick with the "cheap stuff": 87 octane and dino oil. The engine isn't designed to need what higher octane numbers provide, and changing dino oil TWICE as often as what is called for is still cheaper than using synthetic at the manual-dictated interval. If you're doing the oil thing for ecological reasons, synthetic still has to be disposed of like dino oil, and you aren't using enough dino oil to increase the depletion of the world's oil reserves appreciably.

Something like Sta-bil is okay to add to your gas, especially if you're going to let it sit a couple of months. During the peak of mowing season, though, as long as you're only keeping a 5 gallon can around, you'll use the gas long before it starts to break down.
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Old 06-06-2009, 03:27 PM   post #12 of 25
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Default Re: using synthetic oil and premium (93octane) fuel....

Quote:
Originally Posted by Jopopsy View Post
Okay, regular 87 octane fuel. What about Deere Dino Oil vs. something like Mobil 1? My first oil change w/ the new X320 is happening this month ...
You should not use synthetic oil until you reach the 100 hour mark. Dino oil aids in seating the rings properly and it takes almost 100 hours of operation for that to happen. If you put synthetic in at this early stage, your rings may not seat properly - ever.
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Old 06-06-2009, 04:34 PM   post #13 of 25
Erich.VonGeist
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Default Re: using synthetic oil and premium (93octane) fuel....

Hi,
Good to know about the ring seating aid of dino oil. When I do get the chance to buy a brand new deere, I'll make sure to use it.
My old sx95 is probably long past 100 hours by now.
I guess it will be ok to use synthetic now. 10w30 I guess.
I really just want to keep my deere running right as long as possible.
I have had all the belts replaced (3 all together including the deck belt) with genuine Deere belts, replaced the air filter with the spec dual element, and off course sharpened the blades. I'm not sure if I need to replace the spark plug or not, the engine runs great. Just thought that using synthetic oil might help preserve the engine. It's a kawasaki 12.5hp 460????? engine and I don't think they make it anymore. I have heard that it is a very good engine, so if I take care of it hopefully it will last.
Could you offer me some tips that will help maintain the life of my deere, like proper cutting style, driving etc.? Probably just common sense, but I thought somebody might know what I should avoid for my specific model...(the 87-89 SX95 38"cut).
Thanks again,
Erich
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Old 06-06-2009, 05:51 PM   post #14 of 25
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Default Re: using synthetic oil and premium (93octane) fuel....

Quote:
Originally Posted by Stash View Post
You should not use synthetic oil until you reach the 100 hour mark. Dino oil aids in seating the rings properly and it takes almost 100 hours of operation for that to happen. If you put synthetic in at this early stage, your rings may not seat properly - ever.
Thank you !!!
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Old 06-06-2009, 08:38 PM   post #15 of 25
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Default Re: using synthetic oil and premium (93octane) fuel....

Follow what the JD manual sez and you can't go wrong. If JD thought there's be any benefit to "high test" over 87 "regular" they'd put it in the manual like Stihl does. They want 89 octane or better in their 2 strokes.

I believe if you change oil within the equipment mfg'er's spec it doesn't make much difference between 'stegosaurus snot" or "molecular managed oils", especially in a GT/LT.

BUT... let me re-up this great post from last week, an oil maven's "must read". (still didn't change my mind on GT oil)

http://www.mytractorforum.com/showth...synthetic+oils

I suppose some "synthetics" do have a place in GT/LT tractors... How many of us are sitting on a "natural leather" JD seat anymore?
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