Oil Consumption; Gas-Fueled Engine Oil Servicing Instructions; Oil Analysis - Kohler SFGLD480 Operation & Maintenance Manual

1. DESCRIPTION
This Product Information document clearly explains an oil monitoring procedure in order to determine oil change
intervals for gas-fueled engines whose specifications are defined in Product Information IC-G-D-25-003e and
IC-G-D-25-002e.

2. OIL CONSUMPTION

A small amount of lube oil is consumed in the combustion process. In general, oil consumption decreases with
the operation of the engine or any rise in temperature. After the first 600 hours of operation, the oil demand
should be considered constant. From then on, it is advisable to check the oil consumption, which should be as
follow:
Engine
FGLD/SFGLD/SFGM/HGM 180/240/360/480
SFGLD 560
SFGM/HGM 420/560
In order to calculate an engine's oil consumption, the following formula applies:
Specific consumption (g/kWh) = [ 897 x Consumption (liters) ] / [ Power (kW) x Hours of operation ]

3. OIL ANALYSIS

As a reference, Kohler
maintenance instructions in respect of lubricant for use in gas engines.
Product Information sheet IO-C-M-25-001e describes the oil sampling procedure for its subsequent analysis,
while document IO-C-M-25-004e deals with the oil change procedure.
NOTE
Changing oil from an engine does not only consist in draining the crankcase and cooler, but it also
implies changing the oil filters.
Oil change intervals should not exceed the recommendations (due to the deterioration of the additives), unless
there is a careful oil analysis program established. Even in this latter event, however, remember that rather than
predicting the exact moment additives will fail, laboratory analyses normally aim at detecting engine malfunctions.
It is therefore important to inspect the engine before deciding on any modification of the oil change intervals.
Besides on oil consumption, the useful life of oil is highly dependent upon the thermal and mechanical stress oil is
subjected to, the volume of circulating oil, the engine wear and tear, and most importantly the fuel gas
composition and quality, since the oil change intervals will vary as a function of the quality of the biogas or
biomass gas used as fuel.
With those analyses, wear and tear of the engine can be efficiently monitored and actions taken in order to
ensure good performance at a minimum cost, before serious and costly failures occur.
PRODUCT INFORMATION
IO-G-M-25-001e

GAS-FUELED ENGINE OIL SERVICING INSTRUCTIONS

Standard consumption g/kwh
recommends that oil analysis should be conducted as specified in the
INDEX
G
0.35
0.20
0.15
5.2.1
DATE
Dep.2
January 2015
O&M_2.002211.810_A_10_2016
Maximum consumption g/kwh
< 0.5
<0.3
<0.2
1/4