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Originally Posted by blue2000s
I'd go with what the manual says to do.
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YES - generally that's a good recommendation. But, this assumes
ideal conditions which rarely applies to anyone.
Short Trips, infrequent trips, Stop & Go, dusty conditions (incl. frequent expressway driving), hot climate, spirited driving, long idling periods, aftermarket intake and/or filter, will all put you outside this ideal zone and the change interval needs to be adjusted accordingly. Most owners manuals will state this.
At least once annually or every 7500-10k mi. (whichever comes 1st) is probably the best all-around recommendation.