I've been around and around on oil weight... I believe I had inquired from GM on this answer also. They recommend not running anything other than the 5w30... Primarily due to tighter tolerances (main bearings etc) on newer engines.
high mileage oil weight?
I have a 2011 silverado 5.3L which I got around 80k miles. Ive been running Pennzoil Ultra Platinum 5w-30 Synthetic since I got it. I was looking into running a high mileage synthetic like mobile 1 high mileage full synthetic but wasn't sure If I should stick to the factory recommended 5w-30 or Ive read that some people change the oil weight in high mileage vehicles. What do you think? I have about 97k miles on it now.
Thanks in advance for your suggestions.
Thanks in advance for your suggestions.
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