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post #16 of 25 Old 08-18-2014, 09:33 PM
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Re: 10w30 Oil to thin for summer use above 86F

That's what we need to hear...actual long term owners opinons..such as Coach..His use was synthetic multigrade...there does seem to be a difference in it compared to conventional at the low ends...Not sure why..as they both are very thin 10w...offering very little cushioning for the bearings in hot summers..Then again, Maryland does Not get as hot as many southern states during the long summers...A lot has to do with where we live..and whether we're dealing with older "flathead" engines or OHV and OHC..the way I see it.
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post #17 of 25 Old 08-19-2014, 09:59 PM
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Re: 10w30 Oil to thin for summer use above 86F

One thing I've heard/read is synthetic oil runs 20 -50 degrees cooler because of reduced friction and better heat dissipation. While Md. May not get as hot or for as long as the Deep South , I've done plenty of cutting in 90 degree plus weather. Although this year has been especially mild with not a lot of days out of the 80's.
Ps. If I could find a straight 30 weight in a synthetic I might use it. I've yet to see it on a store shelf.
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post #18 of 25 Old 08-24-2014, 09:50 PM
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Re: 10w30 Oil to thin for summer use above 86F

Good info , Coach...Yes to the st 30 weight in synthetic...I had another thread on that very same thought...Why 'won't' any major oil company make syn in straight weight....?
Dunno..!
My only concern is 'long term' ware on the sleeve bearings in older engines..from reduced cushioning of 10w [or now 5w----or OMG, 0w]...All in all, we owners may not keep the engines long enuf to evaluate long term problems..And besides, if your engine suddenly"threw a Rod'...would you be able to "directly' correllate to the type of oil ?

Last edited by suspicionofignorance; 08-24-2014 at 09:53 PM. Reason: added
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post #19 of 25 Old 06-24-2015, 01:52 PM
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Re: 10w30 Oil to thin for summer use above 86F

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Originally Posted by TUDOR View Post
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.
Cars and trucks are water cooled engines. They can run multi vis oils. Air cooled engines will shear down a 5w what ever in no time. Air cooled engines run much hotter than water cooled engines do. Stick with 30w in air cooled mowers, unless your manual states other info. Over 50F run a 30W.

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post #20 of 25 Old 06-24-2015, 07:29 PM
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Re: 10w30 Oil to thin for summer use above 86F

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Originally Posted by slomo View Post
Cars and trucks are water cooled engines. They can run multi vis oils. Air cooled engines will shear down a 5w what ever in no time. Air cooled engines run much hotter than water cooled engines do. Stick with 30w in air cooled mowers, unless your manual states other info. Over 50F run a 30W.

slomo
Define 'no time'.

Recommended oil change intervals for air cooled small engines are less than half of the recommended intervals for cars and trucks. A typical car running errands around town will get up to 150 hours put on the engine with a 3000 mile oil change interval. The recommended interval for air cooled small engines is 25 - 50 hours, depending on when it was made and who made it.

If small engines operated as hot as you infer, most would seize the main bearings in short order. The bottom end of an automotive liquid cooled engine is not cooled except by lubrication, the same as air cooled engines.

Most aircraft piston engines are air cooled and use multi grade motor oil. They can see temperatures of 80+ on take off, -20 during the flight, and 30 or less on landing at their destination only a short time later.

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post #21 of 25 Old 11-19-2015, 07:41 PM
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Re: 10w30 Oil to thin for summer use above 86F

Hi everyone all the air cooled lawn tractors and lawn mowers that run a flat head style motor or a L head motor tell you to run 30w non detergent and the same company's that make the flat head or L head Motors make over head valve motors and recommend 10w30 or 5w30 in their over head valve motors because of hydraulic valves in the motors
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post #22 of 25 Old 11-19-2015, 10:29 PM
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Re: 10w30 Oil to thin for summer use above 86F

i run 10w30 in majority of machines all year. i will tell you this local repair shop told me never run synthetic oil in newer engines has it will soften the plastic parts on the inside like oil slinger or cam gear. i never buy synthetic in first place so i dont know lol.

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1971 ss14 early model in progress
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post #23 of 25 Old 11-20-2015, 03:07 AM
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Re: 10w30 Oil to thin for summer use above 86F

A straight weight oil ("SAE30") is composed of, well, 30 weight oil. A multiviscosity oil ("10W30") is composed primarily of 10 weight oil with an additive that makes it behave like 30 weight oil when hot. So when that multiviscosity oil is is being used in the winter it will flow better but then not be too thin when the engine is used in the summer. The negative aspect of a multiviscosity oil is that the additives that make it behave like 30 weight oil break down more quickly and do not last as long as a straight 30 weight oil would last.

But in this case "hot" is any ambient temperature over 40F. Straight 30 weight oil flows just fine in the summer. So unless you're cutting your grass in the winter (?) there's no reason to use a less durable, multi-viscosity oil. You certainly can of course, but a manufacturer is making their recommendation from the perspective that a typical homeowner is going to abuse the crap out of their mower and never change the oil, and again, the 30 weight lasts longer.

A car is a lot different; you drive in both the summer and winter so it makes sense that a manufacturer would recommend a multiviscosity oil. A manufacturer isn't going to expect an owner to run out and change their oil the same day a cold snap occurs, right? I suppose if you lived in a moderate climate like San Diego it would make sense to run the more durable, straight 30 weight oil year around for more life out of your oil ... but we're not all Californians.

A car also has a much better, pressurized lubrication system of course. I think that's the primary reason for the longer time spans between oil changes -- nothing to do with the oil type.
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post #24 of 25 Old 11-20-2015, 02:37 PM
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Re: 10w30 Oil to thin for summer use above 86F

Let it be noted that engines stabilize at roughly the same operating temperature in summer and winter, especially the liquid cooled GT engines. That's the temperature that the oil has to deal with for longevity.

Starting an engine is a different story. Not all areas of the continent have summer low temperatures that are consistently above 50 where 30W oil is thin enough to allow a starter to easily spin an engine.

Both single and multi-viscosity oils work well at operating temperature. The same is not true for starting temperatures. The battery had better be up to snuff if your area is noted for low ambient temperatures and a single weight lubricant is utilized. An operator can't always wait for 70 temperatures before mowing the lawn. Many GTs are operated year round on a single oil change.

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post #25 of 25 Old 11-20-2015, 04:17 PM
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Re: 10w30 Oil to thin for summer use above 86F

If it is above 86F I will be inside in the air conditioning,and will wait for cooler weather to mow.. A life time in michigan ,I can handle snow and ice and cold weather ,,,I know you guys in the southern states ,think 86F is only warm ,,, It's too hot for me ,,I run 10w30 in all the small equipment and do fine.
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