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.
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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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