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Re: switching to synthedic oil on high mileage truck
From my experiences it can be true. My dad's friend had always used normal oil in his Pontiac LeMans and he switched to Mobil 1 and it ran really shitty he said that it broke a lot of gunk up. He's since switched back to normal oil and hasn't had any problems.
However my neighbor switched to Mobil 1 with close to 100k miles on his car and he had no problems. So I guess it just depends on the engine.
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