JLG 340AJ Operation And Safety Manual page 97

NOTE: Aside from JLG recommendations, it is not advisable to mix oils
of different brands or types, as they may not contain the same
required additives or be of comparable viscosities. If use of
hydraulic oil other than Mobil 424 is desired, contact JLG Indus-
tries for proper recommendations.
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SECTION 6 - GENERAL SPECIFICATIONS & OPERATOR MAINTENANCE
OIL SAMPLING
See Figure 6-1., Oil Sampling Port.
This machine is equipped with an oil sampling valve to allow for
verification of hydraulic oil condition. Refer to the Service Manual
for Oil Sampling procedures.
– JLG Lift – 6-5