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Old 04-14-2004, 11:22 AM   #1
Tommi
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Default What oil is recomended for warmer weather, 10W 30 or 5W 30?

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Old 04-14-2004, 11:25 AM   #2
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Typically heavier oil (ie 10w) for hotter weather...
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Old 04-14-2004, 11:54 AM   #3
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Quote:
Originally posted by soso3
Typically heavier oil (ie 10w) for hotter weather...
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Old 04-14-2004, 01:50 PM   #4
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Higher number for higher temps is how I remember (5w vs. 10w)

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Old 04-14-2004, 02:07 PM   #5
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Ran both down here in South Florida with no noticable differences.
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Old 04-14-2004, 08:33 PM   #6
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10w-30 or 10w-40 is good for warmer weather.
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Old 04-14-2004, 10:34 PM   #7
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What oil would you run if it were 70-80 and sunny year round?
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Old 04-15-2004, 01:12 AM   #8
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If you drove hard maybe 10w-40.
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Old 04-15-2004, 01:58 AM   #9
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I'll be switching to 10W-30 once it warms up in the Tri-State area. Anyone have an explanation of the 2nd number in the 10w-30 ?
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Old 04-15-2004, 02:41 AM   #10
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Old 04-15-2004, 07:47 AM   #11
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Thanks for the info fellas...
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Old 04-15-2004, 08:15 AM   #12
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I run 10-30 all the time here in Houston.
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Old 04-15-2004, 11:06 AM   #13
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I run Mobil 1 15W-50...all year long.
the W in oil grades stands for winter, many people mistake it for "weight"
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Old 04-15-2004, 12:01 PM   #14
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10W-30

when I lived in CO, I used 5W-30 in the winter

but I knew of guys who were running 0W-30 in the winter
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Old 04-15-2004, 12:21 PM   #15
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The benefit of using an oil with a lower spread between it's cold/hot weights is that it requires fewer viscosity index improvers which will make the oil more shear stable. This means the oil won't thin out very quickly and is more stable.

In reality, you can safely run anything from 0w30 to 10w30 in any conditions since they are all nearly the same viscosity when fully warmed up (hence the 30).

Technically, when looking at the specs of M1, the 0w30 weight oil is actually slightly thicker than the 5w30 and 10w30 at hot temps!

The newer oils in the M1 line to look at are the 0w40 and the new Truck&SUV 5w40 oils. These have the benefit of still having extremely low pour points and being thicker when hot. The Truck&SUV formula reportedly has a stronger additive package in it so it should also hold up better with longer drain intervals.
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Old 04-15-2004, 01:18 PM   #16
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So is anyone in the hot areas of the US using 10w-40 or 5w-40?? Just wondering. Thanks for clearing this up guys.... since 5w and 10w are about the same, except when cold, I'll just stick to the same 5w-30 year round
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