Green Valve Stem Covers
I went to add some air into my tires for my camper and noticed they were green valve stem covers. I remember someone telling me once that green caps usually indicate the tire is filed with nitrogen. D...
Forum Discussion
I have green caps and nitrogen filled tires. I wish everyone did because it's good for the environment. I have noticed many tires several pounds low on air and that has a direct result in reducing gas mileage which adds to carbon emissions to the atmosphere. This doesn't apply to battery cars though.
