Weichai America Corp.
Revision: August 2019 10
Fuel Information
Natural Gas
Your engine is certified to run on "pipeline-quality natural gas". Pipeline quality natural gas is
supplied by a natural gas utility through a pipeline. It must be composed of at least 70% methane
by volume or have a heating value of 950-1100 BTU per standard cubic foot (HHV). Maximum
allowable H2S is 55ppm.
Liquid Propane Gas (LPG)
HD5 grade propane which consists of minimum of 90% propane, maximum of 5% propylene,
and maximum 5% of other gases (is o-butane, butane, methane, etc.) Maximum allowable H2S
is 55ppm.
Wellhead Gas (Non-Emergency Only)
Your WP04 naturally aspirated engine is certified to run on "wellhead-quality natural gas". It must
have a heating value of 700-2362 BTU (a fuel switch should be used if above 1800BTU) per
standard cubic foot (LHV). Maximum allowable H2S is 55ppm.
Oil and Coolant Information
Natural Gas Engine Oil
Weichai America Corp. recommends using a straight weight or multi-weight low ash content oil
specifically formulated for Natural Gas Engines. Specific weight depends on operating
temperatures. Consult your oil supplier for specific product recommendations.
Relation between oil viscosity and ambient temperature
Lubricant
SAE Viscosity
grade
Ambient temperature (°F)
Ambient temperature (°C)
0W-20
-31 to 68
-35 to 20
5W-30
-22 to 86
-30 to 30
10W-30
-12 to 86
-25 to 30
15W-40
-4 to 104
-20 to 40
20W-50
5 to 113
-15 to 45
API No. CI-4 or above are also recommended.
Engine Coolants
Weichai America Corp. recommends using a 50/50 mixture of fully formulated Ethylene Glycol
or fully formulated Propylene Glycol coolant and distilled water. Follow recommended coolant
maintenance practices by coolant supplier.
WEICHAI & PSI SERVICE MANUALS AVAILABLE ONLINE AT FLYPARTSGUY.COM
GET YOUR WEICHAI & AFTERMARKET SERVICE PARTS AT FLYPARTSGUY.COM
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