Actually, for most of these engines, 6 quarts will put the level about midway in the "O.K." range. That's why the dealers will often charge you for 7. If you feel the need to be full-up, you will probably need 6-1/2 qts.; but as the manual states, 6 quarts is adequate.
If your dipstick shows full with 6 quarts, you may have some sludge build up in the pan, or the oil did not drain completely. To a point, this is no cause for alarm.
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