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Synthetic vs conven...
 
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Synthetic vs conventional

  

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I have a 2003 ford taurus with 183k miles on it, and this is my first oil change since taking ownership of this car. I am looking at putting high mileage 5w-30 full synthetic oil in the car, but will this harm the engine if it previously had a different oil in it?


3 Answers
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Just use whatever oil recommended by your owner’s manual, for your vehicle. And don’t flush it.


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See here:  just make sure to keep the viscosity the same as what is called out in your owner’s manual.

https://carkiller.com/scottykilmer/qa/oil-change-10/#post-51891


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Synthetic.....make sure it’s the same velocity.....


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