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post #1 of 25 Old 06-28-2013, 02:06 PM Thread Starter
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10w30 Oil to thin for summer use above 86F

Because air cooled engines run hotter the hotter the ambient temperature gets 10W30 is not recommended In my owners manual if you mow in summer temperatures in the upper 80s and above.

Is 30W oil the best oil to use for air cooled engines for non winter use? According to the chart it has hottest temperature range.

According to the owners manual for STX38 oil temperature limits
5W30 -31 +50F ambiant temp
10W30 -4 +86F
10W40 -4 +104F
30W 32 +122F

Last edited by JDSTX38; 06-28-2013 at 02:19 PM.
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post #2 of 25 Old 06-29-2013, 11:31 PM
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Re: 10w30 Oil to thin for summer use above 86F

Yes use 30W only the other oil is to thin
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post #3 of 25 Old 06-09-2014, 02:50 PM
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Re: 10w30 Oil to thin for summer use above 86F

I agree with both you guys. When in doubt over 50F use 30w oil.

Think the reason people use 5w-30 or insert any other non 30w oil for over 50F temps is that's all they have on hand in the garage. Also cheaper to buy the lighter oils compared to 30w. And lets face it, American's are lazy. Then we troll Craig's List and find all kind of blown up mowers for cheap. Wondering what happened to them?? Most push mowers hold 18 to 20 OUNCES of oil. Freak'in people are too lazy to change it. I appreciate it though so I can score cheap mowers.

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post #4 of 25 Old 07-21-2014, 09:51 PM
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Re: 10w30 Oil to thin for summer use above 86F

Quote:
Originally Posted by JDSTX38 View Post
Is 30W oil the best oil to use for air cooled engines for non winter use?
No. Briggs & Stratton recommends full synthetic 5W-30 as the best possible protection in all seasons (at least for their engines).

From Briggs & Stratton's website: http://www.briggsandstratton.com/us/...ecommendations

Personally, I use Amsoil ASE 10W-30/SAE 30 in my small air-cooled engines: http://www.amsoil.com/shop/by-produc...?code=ASEQT-EA

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post #5 of 25 Old 07-21-2014, 10:17 PM
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Re: 10w30 Oil to thin for summer use above 86F

The only thing that goes in my mowers all year round is Amsoil 10w30 synthetic. Been using it since it came out with no problems.

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post #6 of 25 Old 07-21-2014, 10:50 PM
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Re: 10w30 Oil to thin for summer use above 86F

I've always used SAE30 and never had an issue (knock on wood). The only exception to that is in the winter when I was using my lt4000 for snow plowing, then I was using 10w-30. All the manuals for my machines say use SAE30 and that's what I use. All my stuff is over 10 years old though, newer machines might be different. My recommendation is do what the manual says.

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post #7 of 25 Old 07-22-2014, 12:22 AM
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Re: 10w30 Oil to thin for summer use above 86F

Those temperatures are for a reasonable starting load and flow rate for the bearings at ambient temperature. Once the engine has run for a while doing work, the oil temperature will be in the upper range of the 100 - 200 scale, no matter what the grade of oil or the ambient temperature. It just takes a while longer to get there in the colder temperatures.

The 5W or 10W means that the modifyers used in the additive package will allow it to flow at the correct rate for bearings at the colder temperatures, and the -30 means that it will flow at the correct rate when the engine is warmed up to operating temperature. You can use a lighter weight oil at higher ambient temperatures without worry, but heavy weight oil at colder temperatures weighs heavily on the starter motor and battery and runs a risk of poorly lubed bearings and the wear associated with that situation.

My tractor can see temperatures from -30 F to +80 F in a 3 month time frame from March to May, and again from October to December. I try to schedule the oil changes in mild weather in September or October for the heavy use in winter. Multi grade oil is the only option.

Bob

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Last edited by TUDOR; 07-22-2014 at 12:42 AM.
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post #8 of 25 Old 08-13-2014, 09:15 PM
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Re: 10w30 Oil to thin for summer use above 86F

IMO...Most of what TUDAR mentions about the multigrade oil is correct...but it's been my understanding that the actual oil is what ever the 'low" range number is...10w -30 is therefore 10 weight base oil...the additive /modifyers are simply for the high temp range...where they swell up and prevent the unwanted thinning out...5w is 5 weight and very thin oil...I would have concerns about using it in older engines with wider bearing clearences..and in hot summers....Did see a older Briggs chart that showed 10w-30 only useable to 85 deg F...then saw same chart , few yrs later showing it up to 100 deg..Depending on where you live...think st 30w is best for older engines..at temps above 40 deg...or 10w-30 for any OHV eng...Just my opinon..

Last edited by suspicionofignorance; 08-13-2014 at 09:40 PM. Reason: correct
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post #9 of 25 Old 08-13-2014, 09:40 PM
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Re: 10w30 Oil to thin for summer use above 86F

Base is 10 for 10w30. Base is 5 for 5w30 etc. Low number is the base grade and then additives make it go to the higher number when hot.

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post #10 of 25 Old 08-14-2014, 06:59 PM
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Re: 10w30 Oil to thin for summer use above 86F

Yup....Thats exactly what I was saying....5W-30 is really a 5 weight base oil...no modifyers help the extreme thin viscosity of it at warm ambient temps...So why is it becoming more and more recommended for air cooled mowers in hot summer use.,...?
Is 0w-30 going to be recommend soon also..? If so, maybe the oil companies are looking to reduce manufacturing costs...cuz NO auto eng is using straight weight oils..and auto/truck is prob 99% of their sales..and theyre 'biased" for miles/gal..EPA,..

Last edited by suspicionofignorance; 08-14-2014 at 07:13 PM.
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post #11 of 25 Old 08-14-2014, 07:29 PM
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Re: 10w30 Oil to thin for summer use above 86F

Why do cars and trucks use multi-grade oils? Because of wide variations in ambient temperatures between oil changes.

While some owners have high mileage numbers in relatively short time frames, others have low mileage in much longer time frames. The population in general is getting older and not driving back and forth to work as much. An oil change done at the proper time intervals (well short of the normal mileage interrvals) may have to deal with winter temperatures if done in February and warm spring temperatures in May. That can easily span from - 30 to +80 F in the northern states and Canada.

GT's deal with the same circumstances. Many do less than 50 hours of service in 12 months between mowing and snow removal.

Bob

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post #12 of 25 Old 08-14-2014, 07:53 PM
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Re: 10w30 Oil to thin for summer use above 86F

My Onan air-cooled engines love to burn 10w30 if I run that oil in the summer, my Kawasaki liquid cooled FD620D in my scag ran fine on 10w30 in the high heat of summer.


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post #13 of 25 Old 08-14-2014, 10:32 PM
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Re: 10w30 Oil to thin for summer use above 86F

Strange to me that B&S would recommend 5W-30 synth when all the sites and Service Manuals for specific engines recommend SAE 30 for above 50 degrees or so with 5W - 30 synth not recommended in the upper ranges.

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post #14 of 25 Old 08-15-2014, 09:35 PM
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Re: 10w30 Oil to thin for summer use above 86F

Its a conspiricy...Ha!...Why is 5w synth ok at full swings of temp...but convential 5w is not ? Assuming they both are 5w base oil in the multi vis...Why did the national chain, Jiffy Lube stop dispensing 10w-30,,all overhead dispensers are now 5w-30...?Its all for the money...EPA mileage MPG mandates for cars/trucks...I think it's cheaper for the manufactures to risk some degree of warranty failures..than to pay the fine to the FEDS..as I'm sure their accountants have told them.
Our Small engine world...minor concern..and Chinese made engines are low cost..[throw aways]....Nobody cares if you get 5yrs or 15 yrs life out of the engines..Residental...and from neighbors that I see...they don't care either...run it -stops, buy another new one.
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post #15 of 25 Old 08-18-2014, 08:47 PM
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Re: 10w30 Oil to thin for summer use above 86F

I've been running 10w-30 synthetic in my stx38 for 22 years with no ill effects.
Now if there was a way to keep things from falling off or the hood from cracking, I'd be happy.
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