Lexus GX550 2025 - Electrical System

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8-1. Specifications
*1
: The coolant capacity is the quantity of reference. If replacement is necessary, contact
your Lexus dealer.
*2
: Vehicles without rear air conditioning system
*3
: Vehicles with rear air conditioning system
■ Spark plug
Cooling system
Capacity
*1
Intercooler coolant 3.9 qt. (3.7 L, 3.3 Imp. qt.)
Engine coolant
13.8 qt. (13.1 L, 11.5 Imp. qt.)
*2
16.1 qt. (15.2 L, 13.4 Imp. qt.)
*3
Coolant type
Use either of the following:
• “Toyota Super Long Life Coolant”
• Similar high-quality ethylene glycol-based non-
silicate, non-amine, non-nitrite, and non-borate
coolant with long-life hybrid organic acid technol-
ogy
Do not use plain water alone.
Ignition system
Make DENSO EC22HPR-D7
Gap 0.028 in. (0.7 mm)
NOTICE
■ Iridium-tipped spark plugs
Use only iridium-tipped spark plugs. Do not adjust gap when tuning engine.
Electrical system
Open voltage at 68°F (20°C):
12.3 V or higher
(Turn the engine switch to OFF and turn on the high
beam headlights for 30 seconds.)
If the voltage is lower than the standard value,
charge the battery.
Charging rates 5 A max.