I change mine about every 5k or 1 year. With that said it has 3k on it now, but I am going on a 3-4k trip and will change it before I leave and then shortly after I get back. Just my personal preference.
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2002 GMC Sierra C2500 HD 6.6L Duramax Diesel
2013 Sabre Silhouette 291BHTS
Pat, Michele and 2 old dogs, Shug & Sissy