Multipurpose Tractor Oil (MTO)
Caterpillar Multipurpose Tractor Oil is available for use in the
following systems for the Challenger tractor: implement
steering, hydraulic systems, and steering control mechanisms.
Multipurpose Tractor Oil is also recommended for use in the
rear drive axles of the Caterpillar Backhoe Loader. This oil has
an ambient temperature range of -25C (-13F) to 40C
(104F) for these applications.
For ambient conditions that are below -25C (13F), check with
your supplier. The Multipurpose Tractor Transmission Fluids
that are commercially available, must meet the required
ambient temperature capability for your area and must meet
the Ford/New Holland specification of "M2C134-D".
Caterpillar Multipurpose Tractor Oil (MTO) is not the same
as Caterpillar Transmission/Drive Train Oil, and does not
meet Caterpillar's specifications for TO-4 oil. Caterpillar
MTO should not be used in compartments which specify
S· O·S Oil Analysis
SMCS Code: 1348; 3080; 4070; 4250; 4300; 5050; 7542
Caterpillar recommends the use of the SOS oil analysis
program in order to monitor the condition of your equipment.
The S OS oil analysis program will complement your
preventive maintenance program.
Obtaining S· O· S Oil Samples
Before you obtain an SOS Oil sample, operate the machine
until the oil is warm and the oil is well circulated. Then obtain
the SOS Oil sample.
In order to obtain a good oil sample, do not take the oil sample
from the drain stream. The drain stream method can allow a
stream of dirty oil from the bottom of the compartment to
contaminate the sample. Likewise, never dip an oil sample
from an oil container or pour a sample from a used filter.
Do not use the same vacuum sampling pump for
extracting oil samples that is used for extracting coolant
A small residue of either type sample may remain in the
pump and may cause a false positive analysis for the
sample being taken.
Always use a designated pump for oil sampling and a
designated pump for coolant sampling.
Failure to do so may cause a false analysis which could
lead to customer and dealer concerns.
There are two ways to obtain SOS Oil samples. The
following methods are listed in the order that is preferred:
Use an in-line sampling valve for pressurized oil
Use a sampling gun that is inserted into the sump.
Use of the in-line sampling valve is the preferred method. This
method provides samples that are less likely to be
contaminated. Whenever you obtain the samples, obtain the
samples from the same point. This makes the samples more
representative of the oil that is in the system.
In order to obtain an oil sample from the engine compartment,
it may be necessary to increase the engine's speed. Normally,
the oil sample is taken at low idle. If the flow rate is too low,
increase engine speed to high idle in order to obtain the oil
In-line sampling valves cannot be used on nonpressurized oil
systems such as differentials and final drives. Use of the
sampling gun is the preferred method for nonpressurized oil
"Maintenance Interval Schedule" for the proper interval.
The SOS oil analysis is composed of four basic tests:
Wear metal analysis
Infrared analysis for oil condition
Tests for contamination of the oil by fuel, by water,
and/or by antifreeze
Particle Count for hydraulics, transmissions and other
Consult your Caterpillar Dealer for complete information and
assistance about the SOS oil analysis program.