Q: I fill up my gas tank and I put unleaded plus when it is required to put unleaded regular and I always put that on the highway I n

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I fill up my gas tank and I put unleaded plus when it is required to put unleaded regular and I always put that on the highway I noticed the temperature was going up and down not drastically but it was making movement and on a complete stop it shaked

My car has 63000 miles.
My car has an automatic transmission.

Hi Patricia. Thanks for contacting us today. While running the recommended fuel to your car is important, it’s less likely that the swap to a higher octane has created this temperature issue. It’s most likely that there is a different mechanical problem - such as an obstruction of debris in the cooling lines, or a faulty coolant temperature sensor or radiator thermostat. It’s also possible that a fuel system component is clogged with excessive carbon deposits or needs to be serviced. I think the best thing to do have a professional mechanic complete an on-site inspection to determine what is causing this problem - so that any repairs or service can be completed before damage occurs.

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