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Volvo has had problems with valve deposits with these engines in the North American market. This has been attributed to the way North American’s loaf their engines around in comparison to the way European’s tend to drive more aggressively, running the engines harder. It’s good to dip into that pedal to get revs out of the motor and to get the valves nice and hot so they burn off deposits, not build them up.
Interestingly, the brake system on these cars had to be slightly redesigned for our market to for similar reasons; we drag our brakes for long and smooth stops, they stop more abruptly they us. Our style of braking caused rear disks to warp.
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1999 S70 T5
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