Think getting your car washed in the winter is a waste of money? Guess again.

The National Highway Traffic Safety Administration is urging all owners of General Motor's vehicles at least eight years or older to get their vehicle's washed during the winter and to have their brake lines inspected if there are signs of rust, according to a company release.

The warning comes after the agency closed a five-year long probe into 1999-2003 GM trucks and SUVS without demanding a recall over brake systems caused by rust in states that salt their roads.

Vehicles listed in the advisory include: 1999-2007 Chevrolet Silverado and GMC Sierra 1500, 2500 and 3500 series pickups, 2000-2006 Chevrolet Suburban, Chevrolet Tahoe and GMC Yukon SUVs and 2002-2006 Cadillac Escalade and Chevrolet Avalanche SUVs.

NHTSA's investigation found 2,514 complaints, including 88 crash and 20 injury reports. Their investigation determined that the vehicles involved in those incidents didn't have a higher failure rate than similar models that use identical brake line assemblies.

They also weren't able to identify specific defects in brake line retention or routing that could have contributed or caused the failures, according to NHTSA's release.

NHTSA's safety warning did confirm that vehicles built in 2007 or earlier in salt belt states might be susceptible to brake line rust during the winter season.

At this time, GM will not be forced to recall any vehicles which is good news for the Detroit-automaker that called back 30 million vehicles in 2014.

So despite what you may think, it's a good idea to get your car washed in the winter especially if you live in one of the 20 salt belt states.

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