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Oil Level Indicator (OLI)

Des-Case / Visual Oil Analysis


  • Monitor Machine Oil Level
  • Idle / Maximum Oil Level Marker
  • Running / Minimal Oil Level Marker
  • Stain-Resistant Acrylic
  • Brass Fittings Standard (15″ & Above)
  • Optional Stainless Steel Fittings
  • Optional ND-2 Breather

The Oil Level Indicator (OLI) was developed in response to the need of maintenance professionals to gauge the oil level inside large tanks, gearboxes and reservoirs. The OLI is a clear acrylic column with 1/2″ NPT threads at each end. Red and green level marker stickers are included with the OLI to mark upper and lower limits, or to designate running oil level and idle oil level. Utilizing the drain port, operators can visually monitor the fluid level within reservoirs.