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high mileage oil weight?

62811 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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If your in Texas, using a 10W30 instead of a 5W30 will make no difference to your vehicle. The 5, 10 is the way the oil acts when in a cold engine, when the engine warms to operating temps, the oil acts like 30 weight oil.

Some of the advertised high mileage oils have additional additives, to help clean the engine. There are 2 schools on if this is good, sometimes it's best to leave a "dirty" engine alone.
But, you've been running synthetic oil, so your engine will not be "dirty" anyway.

The term "high mileage" may have too meanings, one is an oil for vehicles with high mileage, the other is where extended oil changes are wanted.

I didn't check the oil you where thinking of using, so I don't know which category it falls into.
If cost is a factor, maybe your changing the oil too early.
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.
Mike, I knew the difference, I just wanted to make sure the OP wasn't confusing the two terms.
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