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Originally Posted by bmgoodman
I'm a big fan of Mobil-1 despite the fact I still change at the recommended interval. ... Synthetics flow so much better at cold temperatures that I'm willing to believe in them. I'm willing to spend $400 extra over the life of the car (assuming I keep in 100K miles) for the peace of mind. YMMV. 
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I bought a F-150 20 years ago and put 250,000 miles on it, with many miles towing a 5,000 lb horse trailer in the mountains. I used Mobile-1 in it (mostly 10W-30). It still has the original engine with good compression, and uses (drips mostly

) a quart every 2,000 miles after all that use.
I'm also going to be using Mobil-1 in my TCH despite the extra cost.