The Mobil Vacuoline 500 Series family of products is well known and highly regarded world-wide based on their outstanding performance and the Research and Development expertise and global technical support which stand behind the brand. The highly versatile performance of Mobil Vacuoline 500 Series oils, has made them the choice of many users around the world for many decades.

Mobil Vacuoline 500 series are designed for lubrication of circulation systems of No-Twist Rod Mills, industrial and marine gearboxes, hydraulic systems plus a wide variety of ancillary equipment.

Features Advantages and Potential Benefits
Good protection against rust and corrosion through a balanced high performance lubricant formulation Fewer unscheduled stoppages and lower maintenance costs
Outstanding antiwear performance Excellent protection of critical bearings and gears
Excellent water separation characteristics Rapid separation of water for smooth, efficient operation, reduced downtime and undiminished wear protection
High resistance to oxidation and thermal degradation Long oil charge life and avoidance of costs of unanticipated production interruptions
Multiple application capability Inventory Savings


These oils are intended primarily for the lubrication of plain bearings, roller bearings, parallel shaft and bevel gearing. They are suitable as multipurpose lubricants in systems not subject to shock loading and which do not require extreme pressure performance. The Mobil Vacuoline 500 series possess good demulsibility that is retained under conditions of severe water contamination. Mobil Vacuoline 500 series are used in applications using splash, bath and ring oil arrangements and all other application methods involving pumps, valves and auxiliary equipment. They are recommended for use in hydraulic systems where higher viscosity oils are specified. They are particularly resistant to the effects of prolonged high temperature exposure and perform well in circulating systems with short oil residence times.

Typical applications include

  • No Twist Rod Mills
  • Moderate duty spur, bevel, helical and herringbone gear units
  • Circulating systems
  • Mobil Vacuoline 525, 528, 533 can also be used in hydraulic systems employing gear, vane, radial and axial piston pumps where high viscosity anti-wear hydraulic fluids are required.
  • Certain compressors and vacuum pumps handling air and inert gases provided the discharge temperatures do not exceed 150oC , not suitable for breathing air compressors


Mobil Vacuoline 500 Series meets or exceeds the requirements of: 525 528 533 537 546 548
Morgan Construction Company’s “No-Twist® Rod Mill Lubricants Specification X
Danieli Type 21-0.002117.R BGV No Twist Stand Block-TMB/TFS Rev 14 X

Typical Properties

Mobil Vacuoline 500 Series 525 528 533 537 546 548
ISO Viscosity Grade - 150 220 320 460 680
Viscosity, ASTM D 445
mm2/s @ 40ºC 89 146 215 309 453 677
mm2/s @ 100ºC 10.7 14.4 18.8 24.4 29.4 36.9
Viscosity Index, ASTM D 2270 99 96 96 96 95 89
Pour Point, ºC, ASTM D 97 -24 -21 -15 -12 -12 -9
Flash Point, ºC, ASTM D 92 264 272 284 288 286 286
Specific Gravity @15.6 ºC kg/l, ASTM D 1298 0.88 0.89 0.89 0.89 0.90 0.92
Demulsibility at 54 ºC, ASTM D 1401, Minutes to 37ml water 15 - - - - -
Demulsibility at 82 ºC, ASTM D1401 Minutes to 3ml - 10 15 20 25 5
Demulsibility for non-EP oils, ASTM D2711, ml water 39 38 36 39 35 36
Rust Protection, ASTM D665
Distilled Water Pass Pass Pass Pass Pass Pass
Sea Water Pass Pass Pass Pass Pass Pass
Foaming Characteristics, ASTM D 892Seq I, II, III; Tendency/Stability, ml/ml
Seq I 10/0 5/0 5/0 10/0 5/0 0/0
Seq II 0/0 0/0 0/0 0/0 0/0 0/0
Seq III 0/0 0/0 0/0 0/0 0/0 0/0
Copper Corrosion, ASTM D130 3 hours @ 100ºC 1A 1A 1A 1A 1A 1A
FZG Gear Test, DIN 51354, Failure Stage 12 12 12 12 12 12


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