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I always run sythetic in my rigs. I switch my current truck over at 150K. No issues. I go so far as to use synthetic grease on u-joints and wheel bearings. They are a far superior product. If you run the larger filter and change it you can got 25K on Amsoil products. Throw a by-pass filter in and your oil will look almost new at 25K. Defenitally better on the engine, and can be cheaper over the life of the rig.
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-John
'05 Dodge 3500 SRW 4x4 SLT 5.9 Cummins QC LB NV5600
2003 SR5 4Runner, V6 4WD. 1" cornfed lift
Previous Toyota's '92 Red Truck NALA
Speed doesn't kill, its the sudden stop that hurts.
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