MatWeb - Material Property Data Advertise with MatWeb!     Register Now
Data sheets for over 135,000 metals, plastics, ceramics, and composites.
MatWeb - Material Property Data HOME  •   SEARCH  •   TOOLS  •   SUPPLIERS  •   FOLDERS  •   ABOUT US  •   FAQ  •   LOG IN    
Recently Viewed Materials (most recent at top)  

Login to see your most recently viewed materials here.

Or if you don't have an account with us yet, then click here to register.

  Searches:   Advanced  | Category  | Property  | Metals  | Trade Name  | Manufacturer  | Recently Viewed Materials
Lab Instruments
Phillips 66 Eclipse® SAE Grade 20W-40 T Gas Engine Oil  (discontinued **)
Categories: Fluid; Lubricant

Material Notes: Phillips 66® Eclipse T Gas Engine Oil is a high-quality, very low-ash, dispersant-detergent gas engine oil designed for use in naturally aspirated and moderately turbocharged, low- to mediumspeed 2-stroke cycle and 4-stroke cycle natural gas engines. Eclipse T is formulated with field-proven performance additives to meet the rigorous lubrication demands of modern, fuel-efficient, low-emission gas engines. It provides excellent resistance to oxidation and nitration, protects against ring and liner wear, helps minimize engine sludge and piston deposits for excellent engine cleanliness, and protects against corrosion. It provides excellent deposit control to keep ports clean on 2-stroke cycle engines and to help both 2-stroke cycle and 4-stroke cycle gas engines operate at peak performance.


  • Low- to medium-speed, 2-stroke cycle gas engines where port plugging is a concern
  • Low- to medium-speed, naturally aspirated 4-stroke cycle gas engines
  • Medium-speed, 4-stroke cycle gas engines operating under moderate loads
Eclipse T is recommended for use in natural gas engines manufactured by:
  • Ajax
  • Allis Chalmers
  • Cooper Bessemer
  • Cooper Superior
  • Dresser Clark
  • Dresser Rand (Category I and II)
  • International Harvester
  • Minneapolis-Moiline
  • Waukesha
  • Field-proven performance in providing excellent engine cleanliness
  • Good dispersancy protects against engine sludge and varnish formation
  • Low-ash formulation helps minimize port deposits
  • Excellent resistance to oxidation and nitration
  • Protects against scuffing and wear
  • Protects against rust and corrosion
  • Does not contain any bright stock, which can cause harmful carbon deposits

Information provided by Phillips 66 Lubricants.

Available Properties
  • Specific Gravity
  • Density
  • Viscosity, Cold Cranking
  • Viscosity Measurement, Index
  • Kinematic Viscosity at 40°C (104°F)
  • Kinematic Viscosity at 100°C (212°F)
  • Ash, ASTM D874, Sulfated
  • ASTM Color, ASTM D1500
  • Total Base Number, ASTM D2896
  • Pour Point
  • Flash Point, COC
  • Phosphorous, P
  • Zinc, Zn
Property Data

This page displays only the text
of a material data sheet.

To see MatWeb's complete data
sheet for this material (including
material property data, metal
compositions, material suppliers,
), please click the button below.

Manufacturer Notes:

Category Notes

Materials flagged as discontinued () are no longer part of the manufacturer’s standard product line according to our latest information. These materials may be available by special order, in distribution inventory, or reinstated as an active product. Data sheets from materials that are no longer available remain in MatWeb to assist users in finding replacement materials.

Users of our Advanced Search (registration required) may exclude discontinued materials from search results.

Some of the values displayed above may have been converted from their original units and/or rounded in order to display the information in a consistent format. Users requiring more precise data for scientific or engineering calculations can click on the property value to see the original value as well as raw conversions to equivalent units. We advise that you only use the original value or one of its raw conversions in your calculations to minimize rounding error. We also ask that you refer to MatWeb's terms of use regarding this information. Click here to view all the property values for this datasheet as they were originally entered into MatWeb.


Elmet Technologies
Please read our License Agreement regarding materials data and our Privacy Policy. Questions or comments about MatWeb? Please contact us at We appreciate your input.

The contents of this web site, the MatWeb logo, and "MatWeb" are Copyright 1996-2020 by MatWeb, LLC. MatWeb is intended for personal, non-commercial use. The contents, results, and technical data from this site may not be reproduced either electronically, photographically or substantively without permission from MatWeb, LLC.