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10W30 vs 5W30


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Old  November 9th, 2009, 8:24 AM
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10W30 vs 5W30

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mso-hansi-font-family:Calibri; mso-hansi-theme-font:minor-latin; mso-bidi-font-family:"Times New Roman"; mso-bidi-theme-font:minor-bidi;} .MsoChpDefault {mso-style-type:export-only; mso-default-props:yes; mso-ascii-font-family:Calibri; mso-ascii-theme-font:minor-latin; mso-fareast-font-family:Calibri; mso-fareast-theme-font:minor-latin; mso-hansi-font-family:Calibri; mso-hansi-theme-font:minor-latin; mso-bidi-font-family:"Times New Roman"; mso-bidi-theme-font:minor-bidi;} .MsoPapDefault {mso-style-type:export-only; margin-bottom:10.0pt; line-height:115%;} @page Section1 {size:8.5in 11.0in; margin:1.0in 1.0in 1.0in 1.0in; mso-header-margin:.5in; mso-footer-margin:.5in; mso-paper-source:0;} div.Section1 {page:Section1;} --> </style><!--[if gte mso 10]> <style> /* Style Definitions */ table.MsoNormalTable {mso-style-name:"Table Normal"; mso-tstyle-rowband-size:0; mso-tstyle-colband-size:0; mso-style-noshow:yes; mso-style-priority:99; mso-style-qformat:yes; mso-style-parent:""; mso-padding-alt:0in 5.4pt 0in 5.4pt; mso-para-margin-top:0in; mso-para-margin-right:0in; mso-para-margin-bottom:10.0pt; mso-para-margin-left:0in; line-height:115%; mso-pagination:widow-orphan; font-size:11.0pt; font-family:"Calibri","sans-serif"; mso-ascii-font-family:Calibri; mso-ascii-theme-font:minor-latin; mso-fareast-font-family:"Times New Roman"; mso-fareast-theme-font:minor-fareast; mso-hansi-font-family:Calibri; mso-hansi-theme-font:minor-latin;} </style> <![endif]--> 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.

  #2  
Old  November 9th, 2009, 2:55 PM
  • CF Active Member
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    Daggett CA
blacknblu 
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should be OK.. just give the motor a little more worm up time, and go to the 5W30 at the next change..

  #3  
Old  November 9th, 2009, 3:20 PM
  • CF Beginner
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Thank you very much!

  #4  
Old  November 9th, 2009, 5:36 PM
  • Super Moderator
    Professional Mechanic
    Join Date: Nov 2008
    Posts: 2,955
    Bowie, MD
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.


Last edited by MDTAHOE; November 9th, 2009 at 5:41 PM.
  #5  
Old  November 10th, 2009, 2:51 PM
  • Super Moderator
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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.

  #6  
Old  November 11th, 2009, 11:02 AM
  • CF Beginner
    Join Date: Nov 2009
    Posts: 3
    Edmonton, Alberta, Canada
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..

  #7  
Old  November 11th, 2009, 4:31 PM
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I wouldn't worry about it at all,I run 10w-30 year round I'm in northern Ohio

  #8  
Old  November 11th, 2009, 5:44 PM
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    Ontario Canada
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.

  #9  
Old  November 14th, 2009, 2:59 PM
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    Poland
In cold conditions 5W30 should do better than 10W30. But either will be good if changed often enough.

  #10  
Old  November 16th, 2009, 5:16 PM
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    Corona, CA
I've contacted chevy about this before actually, you'll be fine.

Deez


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