AdBlock WarningParts of this website do not function properly with AdBlock enabled on your device. To get the best user experience on our website, please disable Adblock for this website (domain) on your browser.
Not only is it not necessary, it may damage your engine. Here are advisories sent out to mechanics by the major auto manufacturers listing a bunch of things they try to sell you at a lube shop as unnecessary and possibly dangerous, including engine flushing. Interesting read.. http://media.nbcbayarea.com/documents/Honda+Nissan+GM+Ford+Documents.pdf