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I'm over 60K miles on my '05 Pathfinder and I'm thinking of switching to synthetic motor oil. Can I go up to 10K miles per oil change (a'la my Benz and Jag) switching to synthetic or the oil filter will still limit me to 3K-5K eventhough the synthetic will last longer than that. Also, is it true that once I switch to synthetic I can't go back to conventional oil? Any info would be greatly appreciated.

Thanks.
 

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You can use any kind of synthetic you like, doesn't matter to the engine. You can go from dino to synth any time you like. Check the oil you use for recommended change intervals. Same with the filter.
 

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There are oil filters available that will be good for the lifetime of the synthetic oil. Everyone from Mobil-1 to Fram makes them. Look for words like "extended life" or "synthetic" on the box, then double-check to make sure it's geared for 10K miles of use.

If you can't find one, just use a regular oil filter and change that at the 3K mark. It'll only cost you a pint of oil or so to replace what was inside the old filter.
 

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FYI, Fram filters are the worst you can buy. Go with Wix or NAPA filters if possible. The expensive K&N oil filters didn't get high marks in testing either. ;)
 
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