Scheduled maintenance, when?

[txsurveyor]

i have been using a 5000 mile interval for oil change for the last 10 years because i drive 36,000 to 40,000 miles annually. my opinion is th 3000 mile deal is invented by Jiffy Lube, etc. for business purpose. Check out the other manufacturer recommendation and no one uses 3000 mile. beside my h2, i have a lexus ls400 and and a porsche 911 and neither one uses the 3000 mile guideline. the porsche recommends 15,000 mile for normal service because it is a dry sump system. my last two landcruisers prior to the h2 are on the 5000 mile interval and both of them hit 200,000 mile without absolutely no problem. another benifit is the 5000 mile interval is easy to remember. it is irony that the oil manufacturers provide extended milage on their oil but Jiffy lube uses a reduced milage instead.