anybody use 20w 50 for the summer? - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


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Old 04-19-2006, 12:19 PM   #1
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Default anybody use 20w 50 for the summer?

We have a hot summer coming and I don't feel comfortable using 10w 30 and/or synthetics. I'm sure there are people that use this, I don't see the big deal. What do you think?
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Old 04-19-2006, 01:11 PM   #2
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10w-30w is the recommendation. Our motors were not designed to run anything as thick as 20w-50w
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Old 04-19-2006, 05:17 PM   #3
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I would stay with the 10W30.
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Old 04-19-2006, 06:14 PM   #4
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i live in Sacramento,CA and the summer heat can get to 110 , i have used Mobil1 5/30 winter and summer since i bought the car new in 2000 and have over 120,000 miles on it now. 20/50 will kill your gas mileage, and will not protect your engine as well.

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Old 04-19-2006, 06:21 PM   #5
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theres reasons that the manual tells you to use 5/30 or 10/30. the car will perform best with those grades of oil, if 110* temperatures would make that much difference, then the manual would tell you to use it. GM buldt the car, GM knows the car.
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Old 04-19-2006, 07:38 PM   #6
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yeah i think the farthest you can stray is using straight SAE 30....but yeah, something with a viscosity that high is not a good idea. I put 20-50 in a 2.4L nissan truck...normally gets 35 mpg, then got 15 mpg with 20-50 and that was in hawaii heat...yeah...stick with 10-30
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Old 04-19-2006, 08:14 PM   #7
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I wouldn't use a straight 30 in my car... Just the mower...

Stick with the 5w-30 or 10w-30 depending on where you are... I have in the past used 10w-40 but this oil has more vi modifiers to make the oil strech to a 40 weight... And if you look at the Vin C 3800, owners manual states not to use 10-40... The series II'* don't state that But I wouldn't use it just the same...

The 10-30 will do fine... Many have ran it for 200-300K..

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Old 04-19-2006, 10:07 PM   #8
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The reason I ask is because I know that back in 1984 is when GM started the campaign that higher weight multi-viscosity oils such as 10w 40 and 20w 50 causing harm really had to do with corporate average fuel economy imposed by Uncle scam by mandating use of lighter-weight 5w 30 and 10w 30 in it'* new cars. Doesn't 5w 30 have the same amount of viscosity-extending polymers as 10w 40 and 20w 50? I'm just wondering what all your thoughts about that.
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Old 04-19-2006, 11:13 PM   #9
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If memory serves the 10-40 has more modifiers in it than does the 5w-30 or 10w30 to strech it further, and supposedly its not as good for your car.. And it doesn't yeild economy as good as the 10w30... I don't think economy is always the case either... I also believe that some of the Manufacture ratings also has to do with diffrent tollerances...

There are couple here that could explain this to a very good degree.. But you'll have to forgive me as I don't remember who they are...lol

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Old 04-20-2006, 09:28 AM   #10
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External temp really shouldn't have as much bearing on the oil viscosity once the car is at operating temperature. The engine was designed to pump 5-30 all day, 20-50 is much thicker.
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