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Old 12-10-2012, 02:01 AM   #1
turbobuick33
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Default Is it ok to use 10W30 all year round?

I live in Chicago and wondering if it is ok to use 10W30 all year round even when the temperature gets into the single digits? My Saturn does burn a little oil.

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Old 12-10-2012, 09:41 AM   #2
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Default Re: Is it ok to use 10W30 all year round?

No, it is not. The first number only relates to the low temperature characteristics of the oil. All xW-30 oils appear to be a 30 weight oil at 70F and above oil temperature.

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Old 12-10-2012, 10:41 AM   #3
Gostlrs
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Default Re: Is it ok to use 10W30 all year round?

Depends on what your read I guess...


IMO....Just like this article...Any weight is ok..

Just make sure that you have the same weight to top it off.....

http://www.worldsbestoil.ca/which-30-weight-oil.php

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Old 12-10-2012, 11:22 AM   #4
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Default Re: Is it ok to use 10W30 all year round?

You'll be sorry using 10w40: the first number before the 'W' means winter weight and the second number is for summer weight. 5w20/5w30 is recommended for better fuel economy and better winter starting. 5w means lower temperature starting capability and if you use 10w30/10w40 you risk oil turning to a gel that won't allow dead winter starting or a very slow starter because 10w(30) is too thick for winter use (in Illinois). Either stick with 5w30 or try 5w40. The 5w will allow very cold weather starting. A thicker 30 or 40 (5w30/5w40) may help with lowering oil consumption but is not guaranteed.

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Old 12-10-2012, 11:43 AM   #5
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Default Re: Is it ok to use 10W30 all year round?

I wouldn't recommend it. You could run 5W-30 all year round, though.

At operating temperature, 5W-30 and 10W-30 are virtually identical. That's what the 30 means (the W part is irrelevant at operating temperature).

The W part refers only to how much thicker the oil gets at cold temperatures. 5W-30 oil will behave like 5 weight oil at cold temperatures (which is still far thicker than 30 weight at operating temperature, and far thicker than you need). Likewise, 10W-30 oil will behave like a 10 weight oil at cold temperatures (in other words, becoming much thicker than the 5W-30 oil, although still not nearly as thick as a straight 30 weight oil).

Even with 0W-30, the oil is far thicker than necessary, at cold temperatures, and virtually identical to 5W-30 or 10W-30 at operating temperature, which is why oil manufacturers claim it is compatible with any engine that requires 5W-30 oil.

In other words, using 10W-30 in the winter will make the oil too thick when cold, and will have no benefit once it warms up.

As far as I know, the only benefit of 10W-30 over 5W-30 was cost and availability, but 5W-30 is typically the same price, now, and is readily available.

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Old 12-10-2012, 12:03 PM   #6
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Default Re: Is it ok to use 10W30 all year round?

I've been using 10w-30 conventional for almost three winters now with temps as low as 20 below and have had no problems. Always fires up right away.

Just saying...

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Old 12-10-2012, 12:03 PM   #7
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Default Re: Is it ok to use 10W30 all year round?

I had my SC2 in Chicago for a couple winters and was using 10W-30. Never found any ill-effects, but neither did I find any gain by using the thicker oil. Stick with 5W-30.

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Old 12-10-2012, 12:20 PM   #8
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Default Re: Is it ok to use 10W30 all year round?

Quote:
Originally Posted by Gostlrs View Post
Depends on what your read I guess...


IMO....Just like this article...Any weight is ok..

Just make sure that you have the same weight to top it off.....

http://www.worldsbestoil.ca/which-30-weight-oil.php
Keep in mind what happens when you are below 100F with these oils. The 10w is too thick to flow adequately cold.

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Old 12-10-2012, 01:51 PM   #9
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Default Re: Is it ok to use 10W30 all year round?

its in the manual for all tempretaures and on the oil cap of ur s series

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Old 12-10-2012, 04:45 PM   #10
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Default Re: Is it ok to use 10W30 all year round?

Quote:
Originally Posted by Recycled Saturn View Post
I've been using 10w-30 conventional for almost three winters now with temps as low as 20 below and have had no problems. Always fires up right away.
You won't see or feel the accelerated wear for many tens of thousands of miles. Doesn't mean it isn't there.

Since 5w30 costs the same as 10w30, why not use 5w30? If you get the 10w30 for free for some reason, run that from the spring until late fall. I've been running 10w30 all summer, next change in a couple of weeks will be back to 5w30

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Old 12-10-2012, 05:00 PM   #11
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Default Re: Is it ok to use 10W30 all year round?

Over 90% of all internal wear occurs at starup. Using an excessively high cold viscosity oil just accelerates this wear. As 0w-30 oil was not available when the Saturn spec was initially drawn up it would be preferred for low temp service.

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Old 12-10-2012, 05:14 PM   #12
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Default Re: Is it ok to use 10W30 all year round?

I'd be using a 5 or 0w30 in Chicago if it were me.

I ran 0w30 and 5w30 in the winter on my S-series always.

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Old 12-13-2012, 07:14 PM   #13
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Default Re: Is it ok to use 10W30 all year round?

One thing to keep in mind is how these multi-viscosity oils work. They start with a base oil (the first number) and then add viscosity enhancers sufficient to achieve the second number at higher temps. The viscosity enhancers are polymers that are rolled up at low temps, and then unroll to become long strings at high temps. 5w-40 has more viscosity enhancers added than 10w-30.

The trouble with these polymers is that they burn more easily than oil, creating carbon. For this reason, I try to buy oil with the smallest difference between the two numbers while at the same time being appropriate for the temps involved.

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