Feel free to elaborate. I keep being told this by professional mechanics, it appears to be the firm conviction of more than one reputable 4x4 magazine - and an

Feel free to elaborate. I keep being told this by professional mechanics, it appears to be the firm conviction of more than one reputable 4x4 magazine - and an experienced overland explorer like Tom Sheppard swear by them. I am open to arguments to the contrary, but simply saying that those of a differing opinion are clueless is hardly an argument.