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Hard to imagine, CerTech Gels actually resurface rings and cylinders with a permanent, extremely hard, low friction surface. Tolerances typically return to better than new specifications. Blow by is history and compression is renewed. Bearings and journals get the same results with a noticeable increase in oil pressure within the first 500 miles. Note: Order 2 syringes for engines larger than 8 liter. Be sure to order enough product to get the job done. Big truck gear boxes and differentials use 1 of our 54ml tubes each.