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Old 06-18-2013, 07:56 AM
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wildstarblazer wildstarblazer is offline
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SAE 30 or 40?

What's best to use in hot summer in small engines. SAE 30 or 40 weight?
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Old 06-18-2013, 08:31 AM
GrassGuerilla GrassGuerilla is offline
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Originally Posted by wildstarblazer View Post
What's best to use in hot summer in small engines. SAE 30 or 40 weight?
What does the manufacturer recommend? Doubt it's SAE 40.
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Old 06-18-2013, 08:49 AM
04cubcadet3235 04cubcadet3235 is offline
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Probably 10w30 or 10w40 like almost always. If its a kohler, use kohler 10w30 engine oil so you don't screw up the hydraulic lifters.
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Old 06-18-2013, 09:21 AM
32vld 32vld is offline
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The 1930's are long gone. There is no reason to use single weight oils. Never seen a small engine require a 40W oil.

But I am not old enough to know what they did back in the Roaring Twenty's.
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Old 06-18-2013, 10:01 AM
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Depends on the ambient temperature you're operating in. The only oil recommendation chart I'm vaguely familiar with, without looking, is Kaws. Their recommendations range any where from 5W20 for the coldest up to straight 40W for 85-100+ degree F. If you're curious, check the engine manufacturer's recommendations.

Last edited by dutch1; 06-18-2013 at 10:04 AM. Reason: correction
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Old 06-18-2013, 12:23 PM
GrassGuerilla GrassGuerilla is offline
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Originally Posted by dutch1 View Post
Depends on the ambient temperature you're operating in. The only oil recommendation chart I'm vaguely familiar with, without looking, is Kaws. Their recommendations range any where from 5W20 for the coldest up to straight 40W for 85-100+ degree F. If you're curious, check the engine manufacturer's recommendations.
And looking at the chart alone one might misinterpret that SAE30 or 40 is better suited than 10-30 or 10-40. Simply not true. Actually what the chart shows is that the SAE30 or SAE40 is not suitable at lower temps. Unless the man specifically calls for a non detergent SAE 40, there is really no reason to consider its use.
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Old 06-18-2013, 01:13 PM
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Restrorob Restrorob is offline
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And looking at the chart alone one might misinterpret that SAE30 or 40 is better suited than 10-30 or 10-40. Simply not true.

Can you explain the bases of this claim ?
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Old 06-18-2013, 03:13 PM
GrassGuerilla GrassGuerilla is offline
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Can you explain the bases of this claim ?
Correct me if I'm wrong, but the straight 30 or 40 is fine at temp, but lacks the ability to work properly below operating temp or in cold (extreme) climates. Other than cold starts aren't we talking a difference of the additive package?
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Old 06-18-2013, 03:24 PM
larryinalabama larryinalabama is online now
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I figure that who ever designed and built the engine would know what the engine requires, therefore I go by that. Sometimes they even put it on the oil cap. Modern engines have closer tolerances or clearences and usually require a lower number than old engines do.

Look at your owners manuel because every engine is different.
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Old 06-18-2013, 04:00 PM
billc1004 billc1004 is offline
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Sae 30 in the summer on most. 10 w 30 during colder start up
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