2010 Jeep Grand Cherokee Owner's Manual - Page 261

260 STARTING AND OPERATING entering. Proceed with caution and maintain a steady Maintenance controlled speed less than 5 mph (8 km/h) in deep water After driving through deep water, inspect your vehicle fluids and lubricants (engine oil, transmission oil, axle, to minimize wave effects. transfer case) to assure the fluids have not been contamiFlowing Water nated. Contaminated fluid (milky, foamy in appearance) If the water is swift flowing and rising (as in storm should be flushed/changed as soon as possible to prerun-off), avoid crossing until the water level recedes vent component damage. and/or the flow rate is reduced. If you must cross flowing water avoid depths in excess of 9 in (23 cm). The Driving in Snow, Mud and Sand flowing water can erode the streambed, causing your In heavy snow, when pulling a load, or for additional vehicle to sink into deeper water. Determine exit point(s) control at slower speeds, shift the transmission to a low that are downstream of your entry point to allow for gear and shift the transfer case to 4WD LOW if necessary. Refer to "Four-Wheel Drive Operation" in "Starting and drifting. Operating" for further information. Do not shift to a Standing Water lower gear than necessary to maintain forward motion. Avoid driving in standing water deeper than 20 in Over-revving the engine can spin the wheels and traction (51 cm), and reduce speed appropriately to minimize will be lost. wave effects. Maximum speed in 20 in (51 cm) of water is less than 5 mph (8 km/h).