Workshop oil sales marketing tool or to check you personal car #39;s lubricant for sludge before deciding to change oil. All modern lubricants contain additives that inhibit breakdown. As these additives are depleted, sludge is formed. The sludge shortens equipment life amp; reduces performance, increasing operating cost. EngineCheckUp oil test is a marketing analysis tool that measures the level of sludge in a lubricant. Package includes: ( gambar #1 ) 1. 100 pcs EngineCheckUp Test paper in a box 2. 100 pcs test reference chart