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high mileage oil weight?

62745 Views 18 Replies 9 Participants Last post by  Truck Guy
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.
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A heads up with the mobile 1 high mileage oil, per the mobile 1 website the high mileage is NOT recommended for extended idling intervals. I have no idea why or what constitutes "extended idle periods". I was running the mobile 1 high mileage in my 5.3l with over 170,000 on the clock until I read that on their site. In the winter my truck idles for 15-30 minutes to warm up before I take my son to school. (Again I don't know what is considered an extended idle period) Then I switched to the standard mobile 1. I have seen no difference in anything when I switched. (Not that I thought I would)

To answer rays question, the mobile one high mileage oil is for vehicles over 75,000 miles. They sell an "extended service" mobile 1 that is for OCI of 15,000 miles. But on my opinion the filter should still be changed at regular intervals. (I have no data to back that up, it just seems to make sense to me)
Mike, I knew the difference, I just wanted to make sure the OP wasn't confusing the two terms.
Oh ok! I kinda thought it was odd that you didn't. Sorry for the confusion.
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