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Use Common Sense -> RE: 5000 to 7500 mile oil change interval, dealer shows 3000 (6/5/2008 3:32:46 AM)
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98% of all vehicles fall under the "SEVERE DUTY". So if using DINO juice, go with the 3-5,000/6 month oil change pattern. If using synthetic, you should still follow the MFG suggested practice. AMSOIL is the only oil MFG that recommends extended drail intervals and stands behind their product. Jonzo, Just curious... How do you know that your cylinders still have the cross-hatch marks on them? Did you pull your head(s)? If so, why? Or did you borescope them for something to do?
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