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< right after a 1000 mile break in period. It seemed to give the car a small increase in fuel mileage >
I would think the slight increase would be your car just breaking in. I can't say I've ever bought a new car personally, however my new motorcycle did the same thing after about 1500miles or so. I actually drive it harder than new and tend to get better mileage anyways. Just my guess...they say the same for sythentics...but I've been using them for years and have seen little to no increase whatsoever in everything I've put them in.
Ryan
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