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Silverado & Fullsize Pick-ups The Silverado has been one of the best selling trucks in the US for decades, and is truly proven to be "like a rock".

2014 Chevy Silverado
Platform: Truck, GMT 400, 800, & 900
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  #1  
Old 11-09-2009, 08:24 AM
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Default 10W30 vs 5W30

Hello all – I’ve searched around, and I haven’t quite found a post that I believe answers a question I have about oil. This past weekend, I changed the oil in my 2007 Chevy Silverado, and went with Mobil 1 Extended Performance 10w30. The user manual calls for 5W30 and states “Do not use other viscosity oils”. We’re coming up on winter, and the morning lows in Kansas City can drop around the 0 degree range. Since I put 10W30 in, should I bite the bullet and replace the oil I just put in this past weekend with 5W30, or will 10W30 suffice? My engine is 5.3L V8 Flex Fuel, and has approximately 52,000 miles. I should know better by now to RTFM before I complete a task.
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  #2  
Old 11-09-2009, 02:55 PM
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Quote:
Originally Posted by blacknblu View Post
Hello all – I’ve searched around, and I haven’t quite found a post that I believe answers a question I have about oil. This past weekend, I changed the oil in my 2007 Chevy Silverado, and went with Mobil 1 Extended Performance 10w30. The user manual calls for 5W30 and states “Do not use other viscosity oils”. We’re coming up on winter, and the morning lows in Kansas City can drop around the 0 degree range. Since I put 10W30 in, should I bite the bullet and replace the oil I just put in this past weekend with 5W30, or will 10W30 suffice? My engine is 5.3L V8 Flex Fuel, and has approximately 52,000 miles. I should know better by now to RTFM before I complete a task.
should be OK.. just give the motor a little more worm up time, and go to the 5W30 at the next change..
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Old 11-09-2009, 03:20 PM
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Thank you very much!
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Old 11-09-2009, 05:36 PM
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The engineers have came up with the oil weight based on the bearing clearances. The 5w-30 will circulate through the engine faster when cold. I run 0-30 in the engine in the winter because it moves faster when cold so it is better for cold starts. Especially since I remote start it 2 times every morning. I would recommend you change it. It maybe ok but it may not. If not it will not cause immediate damage but it may have effect on long term 9like when the 100k warranty is over). In my opinion it is not worth the risk.
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Last edited by MDTAHOE; 11-09-2009 at 05:41 PM.
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Old 11-10-2009, 02:51 PM
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I agree with MDTAHOE. What happens when you have engine trouble, and the warranty department learns you used 10W30 instead of the 5W30?

Look at is as a high quality, low impact engine dirt flush. The thicker oil won't allow as much dirt to return to the engine, and when you drain it hot in a week or so, you can remove the standing dirt and the 10W30 oil. A new filter and the proper viscosity oil will give you both a fresh start on winter, and peace of mind.
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Old 11-11-2009, 11:02 AM
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0 degrees?? I live in Northern Canada. Winter temperatures can go down to -35. I run 10W30 in all of my vehicles - always have ever since they started manufacturing multi-grade oils..
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  #7  
Old 11-11-2009, 04:31 PM
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I wouldn't worry about it at all,I run 10w-30 year round I'm in northern Ohio
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Old 11-11-2009, 05:44 PM
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I would stay away from the 10w 30. GM recomend 5w 30 and with this grade your oil is much more fluid at start up and lubricate the main arteries of your engine faster thus less wear.
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Old 11-14-2009, 02:59 PM
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In cold conditions 5W30 should do better than 10W30. But either will be good if changed often enough.
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Old 11-16-2009, 05:16 PM
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I've contacted chevy about this before actually, you'll be fine.

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Old 11-16-2009, 05:16 PM
 
 
 
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