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Theoreticaly, too much oil ( IE enough to fill into the bottom of the cylinders) can cause damage to your pistons/wrist pins etc as the piston comes down and slaps the dense & incompressible oil. However, an extra quart or so shouldn't bring you any where near that level.
FWIW, I had both a drive through Lube joint and a dealership add extra oil to two different vehicles on two different occasions. This is significant since I have always done 75% of my oil changes on my own. in addition, I've also had these guys over torque /damage the oil filter and drain plug. ( Lucky I guess, i had an uncle who had a dealer forget to tighten the plug and the motor seazed 1/2 way home!) I don't do allot of work on my vehicles any more but now insist on doing 100% of my own oil changes for these very reasons.
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07 Frontier LE, 4x4, Crew Cab, Short Bed, Avalanche White.
Mods: Access Lorado Tonneau, Raamat sound deadener, Custom Audio (JVC KW-GX700, XM, Ipod, Pioneer D702P, CDT HD-62, Infinity Ref, Alpine PDX4.100, Profile AP400 & PioneerTS-SW841D (front seat sub) Remote Start, Yakathule Racks, Wheel Locks, OEM All Season Mats, Silverstar Ultra Headlights, LED Back-ups, 13" Rubber Antenna, EZDown Gate Dampener, Light Buster hitch light.
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