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0w40 oil Mobil 1 #5448623 06/07/20 08:35 PM
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polly Offline OP
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Is it okay to use 0w40 Mobil 1 in my Kubota lawn mower. 24 horsepower Kawasaki please and thank you for your reply.

Re: 0w40 oil Mobil 1 [Re: polly] #5448627 06/07/20 08:41 PM
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walterjay Offline
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Yes. I have been using 0W-40 in my 25 hp Kawasaki garden tractor for years. It is an excellent all year round choice. Have used M1 and Castrol flavors. Currently running M1

Re: 0w40 oil Mobil 1 [Re: polly] #5448648 06/07/20 09:23 PM
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Normac Offline
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Run it! The engine will more than likely outlast the mower.
While I currently run whatever 15w40 is on sale (summer heat, air cooled engine), Mobil 1 0w40 or even TDT (in the summer) is about as good as you can get.

Last edited by Normac; 06/07/20 09:26 PM.

True victory does not come from defeating an enemy, true victory comes from giving love and changing an enemies heart.
Re: 0w40 oil Mobil 1 [Re: polly] #5448670 06/07/20 09:54 PM
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Motorcraft 15W40 at Walmart in a 5 quart jug. lots of zinc


2006 2500 Dodge 5.9 Cummins Mobil Delvac 15W40, Fleetguard Stratapore 90k miles
Early '99 F250 ECLB 7.3 Stroker, 223k miles
Re: 0w40 oil Mobil 1 [Re: polly] #5448785 06/08/20 05:28 AM
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fozzdesy2001 Offline
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I think Mobil 0-40 is one of the best air-cooled engine oils you can get. I use it all of mine, easy to start hot or cold and this oil can take the summer heat.


2001 Subaru Forester S
Replaced with a 2006 Forester

2004 Subaru Forester XT
Death by deer. Replaced with 2003 Impreza Outback Sport (beater)
Re: 0w40 oil Mobil 1 [Re: polly] #5448794 06/08/20 05:48 AM
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Lubener Offline
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Originally Posted by polly
Is it okay to use 0w40 Mobil 1 in my Kubota lawn mower. 24 horsepower Kawasaki please and thank you for your reply.

I would only use that in a snow thrower not a mower.


The "thinking" man's friend.
Re: 0w40 oil Mobil 1 [Re: Lubener] #5448804 06/08/20 06:04 AM
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kschachn Online Content
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Originally Posted by Lubener
I would only use that in a snow thrower not a mower.

And this is why?

Wait, because it’s a “0 weight” oil, right?


1994 BMW 530i, 253K
1996 Honda Accord, 289K
1999 Toyota Sienna, 437K
2000 Toyota ECHO, 290K
Re: 0w40 oil Mobil 1 [Re: kschachn] #5448806 06/08/20 06:21 AM
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Like being in outer space

Re: 0w40 oil Mobil 1 [Re: fozzdesy2001] #5448814 06/08/20 06:32 AM
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Originally Posted by fozzdesy2001
I think Mobil 0-40 is one of the best air-cooled engine oils you can get. I use it all of mine, easy to start hot or cold and this oil can take the summer heat.


Not a bad idea … way cheaper than the Delvac 1 that’s in my power gens …

Re: 0w40 oil Mobil 1 [Re: polly] #5448926 06/08/20 09:15 AM
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walterjay Offline
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My 25 hp Kawasaki seemed to do better on cold winter starts with the M1 vs Castrol. Mobil1 is an outstanding oil for these engines.

Re: 0w40 oil Mobil 1 [Re: kschachn] #5449113 06/08/20 03:29 PM
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Lubener Offline
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Originally Posted by kschachn
Originally Posted by Lubener
I would only use that in a snow thrower not a mower.

And this is why?

Wait, because it’s a “0 weight” oil, right?

But wait, please wait,
there's no need for a 0w- oil in the summer time for a lawn mower.


The "thinking" man's friend.
Re: 0w40 oil Mobil 1 [Re: Lubener] #5449179 06/08/20 05:46 PM
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Normac Offline
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Originally Posted by Lubener
But wait, please wait,
there's no need for a 0w- oil in the summer time for a lawn mower.

.
But if a 0w is thinner to begin with and pumps up faster at startup, the 0w shoul offer wear protection sooner than a 10w or a 15w.
Temperature wouldn't matter here. Summer or Winter - it's still a 40-wt. when the engine is hot.


True victory does not come from defeating an enemy, true victory comes from giving love and changing an enemies heart.
Re: 0w40 oil Mobil 1 [Re: Normac] #5449281 06/08/20 08:19 PM
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kschachn Online Content
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Originally Posted by Normac
But if a 0w is thinner to begin with and pumps up faster at startup, the 0w shoul offer wear protection sooner than a 10w or a 15w.
Temperature wouldn't matter here. Summer or Winter - it's still a 40-wt. when the engine is hot.

An oil with a 0W winter rating is only thinner at temperatures well below 0F, somewhere around -35F or below. No one is cutting grass at that temperature.

And beyond that, thinner oils do not offer wear protection, only ease of starting. Thick oils are what provide start protection due to the MOFT. It is a misconception that thinner oils provide "protection", it is in fact the other way around. Any oil will pump just the same at lawn mowing temperatures - assuming the lawn mower has an oil pump to begin with. The viscosity is similar between an oil with a 0W-XX, a 5W-XX, a 10W-XX or a 20W-XX oil at any reasonable lawn mowing temperature.


1994 BMW 530i, 253K
1996 Honda Accord, 289K
1999 Toyota Sienna, 437K
2000 Toyota ECHO, 290K
Re: 0w40 oil Mobil 1 [Re: Lubener] #5449288 06/08/20 08:29 PM
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kschachn Online Content
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Originally Posted by Lubener
But wait, please wait,
there's no need for a 0w- oil in the summer time for a lawn mower.

No need but no drawback either. Mobil 1 0W-40 FS has a plethora of manufacturer approvals including Porsche A40 which demonstrates and proves it is a superior oil to just about any on the market - and the price at Walmart makes it a steal.

In fact, the truth is that the Mobil 1 0W-40 FS is probably a better grade for a lawn mower than it is for a snow thrower. A 40-grade oil is always going to be thicker than a corresponding 30-grade except at extremely low temperatures (and it doesn't snow at those temperatures), making it more difficult to start the snow thrower. Correspondingly a 40-grade oil provides better protection and higher MOFT to the air cooled lawn mower.

Overkill posted this a while back, it shows how a Porsche A40 approved oil is ideal for an air-cooled engine:

Originally Posted by Overkill
Here is Porsche A40 testing procedure:

This test will last 203 hours. The engine, and the oil, will go through:
- 4 times the simulation of 35 hours of summer driving,
- 4 times the simulation of 13.5 hours of winter driving,
- 40 cold starts,
- 5 times the simulation of 1-hour sessions on the Nurburgring racetrack,
- 3.5 hours of running-in program
Measurements on the engine and on the oil will be done at regular intervals, and the following parameter
will be taken into account to grant the approval or not:
- torque curve (internal friction),
- oxidation of the oil,
- Piston cleanliness and ring sticking,
- Valve train wear protection. Cam & tappet wear must be less than 10 microns.
- Engine cleanliness and sludge: after 203 hours, no deposits must be visible.
- Bearing wear protection: visual rating according to Porsche in-house method.


1994 BMW 530i, 253K
1996 Honda Accord, 289K
1999 Toyota Sienna, 437K
2000 Toyota ECHO, 290K
Re: 0w40 oil Mobil 1 [Re: kschachn] #5449310 06/08/20 08:55 PM
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Normac Offline
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Originally Posted by kschachn
An oil with a 0W winter rating is only thinner at temperatures well below 0F, somewhere around -35F or below. No one is cutting grass at that temperature.

And beyond that, thinner oils do not offer wear protection, only ease of starting. Thick oils are what provide start protection due to the MOFT. It is a misconception that thinner oils provide "protection", it is in fact the other way around. Any oil will pump just the same at lawn mowing temperatures - assuming the lawn mower has an oil pump to begin with. The viscosity is similar between an oil with a 0W-XX, a 5W-XX, a 10W-XX or a 20W-XX oil at any reasonable lawn mowing temperature.


If that is true, than all of the oils you listed would pour the same at room temperature. I guarantee you that a 0w or a 5w pours faster out of the bottle than a 15w or 20w at 70-degrees - seen it personally. If the oil is thinner at startup, it pumps up faster (less resistance) and therefore reaches ported corners of the engine faster than a thicker oil. Any oil is better than no oil, and a thinner oil with theoretically get there before a thicker oil. Plus if thinner oils don't provide 'protection', then so many auto manufacturers wouldn't be going that direction.

Dr. Haas would have us all running 0w20 or thinner in everything with an engine - for reasons listed in his papers, but I don't see that happening either.

Last edited by Normac; 06/08/20 08:59 PM.

True victory does not come from defeating an enemy, true victory comes from giving love and changing an enemies heart.
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