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Ford Explorer Community - Maintenance - Modifications - Performance Upgrades - Problem Solving - Off-Road - Street
Explorer Forum Covers the Explorer ST, Explorer Sport, Explorer Sport Trac, Lincoln Aviator, Mercury Mountaineer, Mazda Navajo, Ford Ranger, Mazda Pickups, and the Ford Aerostar
Mobile 1. My x is @ 120k and I mix 2.5 qts of 5w30 with 2.5 qts of 10w30.
All non synthetic oils will break down over time and you will get a thicker build up of oil crud in you engine. Having used req oils I have seen the difference.
I just read a thread very recently with a guy very knowledgeable on oil study adviced to stay away from Penzoil and another yellow bottle (can't remember- damn short term memory). He highly recommends going synthetics or if you must save $, Valvoline.