I recently put full synthetic high milage in my used 09 ford focus with 134k miles and at first I noticed a better response and smooth driving. But the second day the car felt different. Heavy, like I have heavy load in my car. I was using motorcraft synthetic blend. Could this be that the additives and detergents are doing their job and i should do an oil change soon? The bottle smells like laundry detergent compared to the Motorcraft.
Are you sure that you haven’t overfilled the crankcase?
Just to be sure, I suggest that you pull the dipstick when the engine is cold.
No overfilled. I checked the dipstick after putting the oil and this morning too, after runing the engine.
You are supposed to check oil level before starting most vehicles .
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I can think of no reason that oil of the correct grade, regardless of type, would have any effect on how the car responded. You may have some other problem.
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Might want to check for a dragging brake or a parking brake that did not fully release. Especially after sitting over night. Rainy or snowy or cold where you are? I only use Mobil though and know nothing about motorcraft.
I thought it was the other way around. Let it warm up.
