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I use the Opti-Lube Summer stuff just for added lubrication. Costs about $50/gal but will last for 15k-30k miles depending on the ratio I use. Hopefully cheap insurance for lubrication........provided those lubrication tests are accurate. If not........oh well, I'm out $50.
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2001 F-350 Crew Cab XLT PSD 4x4, Long Bed, 6-speed, 3.73, Manual Transfer, Power TTT Mirrors, 122k miles.
1989 Toyota 4x4 xtracab SR5 V6, Beat to heck with 200k+ miles and still running strong.
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