Sorry to hear about your hips. Years back a oil company, I believe it was Pennzoil or Castrol, can't remember, did an oil wear test on two New York City taxi cabs. I believe they were Ford crown Victoria's with 4.6 modular motors. They ran both cabs hard, typical taxi driver usual, for 100k. One cab they ran the brand name conventional oil, the other, a bargain oil like Flag brand from Oreillys, formerly Kragen. After the 100 k, they dismantled both engines down to the crankshaft. They found 0 difference in wear between the 2 engines. A third taxi was also tested, but used full synthetic. Their was a big difference, basically that taxi had no wear on bearings, cylinder walls, etc. I may be off on the mileage that they tested these 3, but they all had regular oil changes. Not sure what filters they used, but I'm assuming it was a quality one. Years back when I worked with a cab company, our 4.6 crown Vic's would routinely go to the mandatory 350k with original engines before we had to pull them from service. If
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