Specifications
Owner’s Manual for Stationary Diesel Generators 7
Engine Oil Recommendations
To maintain the product warranty, the engine oil should
be serviced in accordance with the recommendations of
this manual. For your convenience, maintenance kits
designed and intended for use on this product are
available from the manufacturer that include engine oil,
oil filter, air filter, spark plug(s), a shop towel and funnel.
These kits can be obtained from an Independent
Authorized Service Dealer (IASD).
All Generac maintenance kits meet minimum American
Petroleum Institute (API) Service Class CD or better.
Select the appropriate viscosity oil grade according to the
expected operating temperature. After break-in, synthetic
oil also can be used in the appropriate weight as
standard. Once synthetic oil is used, it should be used for
the life of the generator. It is not recommended to go
back to a mineral oil. Do not use special additives.
Figure 2-2. Lubricating Oil Recommendations
Coolant Water Treatment
Use of improper coolants can damage the engine cooling
system. Use demineralized water or distilled water for best
results. Hard water causes scale deposits, which reduces
cooling efficiency and raises internal temperatures, possibly
leading to engine damage. Use an anti-corrosive to prevent
rot in summer and anti-freeze to prevent freezing in winter.
Dilute the anti-freeze based on a theoretical temperature that
is 9-18°F (5-10°C) below the lowest temperature expected in
the area. A ratio of 40-60% is most common range.
NOTE: Use only Peak Fleet-Charge® 50/50 ethylene
glycol type coolant (available from any IASD).
IMPORTANT NOTE: Do not use propylene glycol type
coolant. Using the wrong coolant, mixing different types
of coolant, or even mixing different brands of the correct
type of coolant, can produce unsatisfactory results, pos-
sibly leading to engine damage.
Fuel Requirements
IMPORTANT NOTE: DO NOT use Home Heating Oil or
Bio-Diesel Fuel.
Use No. 2D diesel fuel when temperatures are above
freezing. When temperatures are below freezing, blend
No. 1D diesel fuel and No. 2D diesel fuel together for a
climate adjusted fuel ratio.
• Use only Ultra-Low Sulfur Diesel fuel (ULSD)
NOTE: Low ambient temperatures as well as engine
operation at high altitudes may require the use of fuels
with higher Cetane ratings.
Allow at least 5 percent of the tank capacity for fuel
expansion. DO NOT OVERFILL!
Fuel Maintenance
Always treat diesel fuel for long term storage. Use the
approved fuel additive and water abatement material.
Test stored fuel every 90 days and provide additional
treatment if required. Periodically check and dry
abatement material as necessary.
Freezing Point °F (°C) -13 (-25) -31 (-35) -58 (-50)
Coolant (% Volume) 40 50 60
Water (% Volume) 60 50 40
ºC
-40
15W-40
10W-30
5W-30
-30 -20 -10 0 10 20 30 40 50
ºF
-40 -22 -4 14 32 50 68 86 104 122
ºC
-40 -30 -20 -10 0 10 20 30 40 50
ºF
-40 -22 -4 14 32 50 68 86 104 122
002236
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