2008 Volvo V70 Owner's Manual - Page 199

More frequent vehicle maintenance is required. Remove the ball and drawbar assembly when the hitch is not being used. Volvo recommends the use of synthetic engine oil when towing a trailer over long distances or in mountainous areas. WARNING Bumper-attached trailer hitches must not be used on Volvos, nor should safety chains be attached to the bumper. Trailer hitches attaching to the vehicle rear axle must not be used. Never connect a trailer's hydraulic brake system directly to the vehicle brake system, nor a trailer's lighting system directly to the vehicle lighting system. Consult your nearest authorized Volvo retailer for correct installation. When towing a trailer, the trailer's safety wire must be correctly fastened to the hole or hook provided in the trailer hitch on the vehicle. The safety wire should never be fastened to or wound around the drawbar ball. 214 05 During your trip Towing a trailer NOTE When parking the vehicle with a trailer on a hill, apply the parking brake before putting the gear selector in P. Always follow the trailer manufacturer's recommendations for wheel chocking. When starting on a hill, put the gear selector in D before releasing the parking brake. See also page 120 for more detailed information about starting off on a hill while towing a trailer. If you use the manual (Geartronic) shift positions while towing a trailer, make sure the gear you select does not put too much strain on the engine (using too high a gear). The drawbar assembly/trailer hitch may be rated for trailers heavier than the vehicle is designed to tow. Please adhere to Volvo's recommended trailer weights. Avoid driving with a trailer on inclines of more than 15 %. Trailer cable An adapter is required if the vehicle's trailer hitch has a 13-pin connector and the trailer has 7 pins. Use an adapter cable approved by Volvo. Make sure the cable does not drag on the ground. 215 05 During your trip Towing a trailer Detachable trailer hitch (accessory)