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a good synthetic would be better than a dino that has seal swellers in it
 

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I would use normal oil. Keep changing it at the reg schedule you've been on.. I think if you go to thicker oil - and make it last longer, you might be in trouble

Though you are not too high in mileage.
 

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yeah there's a difference between "high Mileage" and a motor that you are trying to nurse for a few more miles with thicker oil. Most of the high mileage oils are marketing anyways
 

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This is what I was told by one of the mechanics at 5 Corners Dodge. If you have always stuck with conventional than keep using it. As the motor gets older it has worn in using the viscosity and other properties of this oil. Synthetic, being more "slippery" thus making it easier to get pass worn seals and valves could actually produce a problem down the road. It's okay to protect your motor but you could be giving it too much of a good thing.

If anything try using a synthetic blend.
 
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