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Suzuki DF300 (V6, 2007 to 2013) service guide

Oil, gear oil, spark plugs and the service schedule for the Suzuki DF300 (V6, 2007 to 2013) (300 hp, four-stroke), from the factory service manual, plus how we service it in Hawaiʻi.

Models covered: Suzuki DF300T (prefix 30001F, standard rotation) and DF300Z (30001Z, counter rotation), 2007 on; and the later DF300T/Z with prefix 30002F/30002Z from serial 110001. V6 DOHC, 4,028 cm³, multi-point sequential fuel injection, drive by wire.

Quick answers

How much oil does a Suzuki DF300 take?
8.0 L (8.5/7.0 US/Imp. qt) oil change only; 8.2 L (8.7/7.2 US/Imp. qt) with filter.
What engine oil does a Suzuki DF300 use?
API SE, SF, SG, SH or SJ, or NMMA FC-W, SAE 10W-40 or NMMA FC-W 10W-40.
What gear oil does a Suzuki DF300 use, and how much?
Suzuki Outboard Motor Gear Oil or SAE #90 hypoid gear oil. Quantity: 1,100 ml (37.2/38.7 US/Imp. oz).
What spark plug does a Suzuki DF300 use?
NGK BKR6E, qty 6. Gap: 0.7 to 0.8 mm (0.028 to 0.031 in).
How often should a Suzuki DF300 be serviced?
The factory schedule lists: Initial 20 hours; Every 50 hours; Every 100 hours; Every 200 hours. In Hawaiʻi's salt water we do a full yearly service every 200 hours or 1 year, whichever comes first, and a new engine needs its first (break-in) service.
When should the water pump impeller be replaced on a Suzuki DF300?
The factory schedule says to replace it at 200 hours, and we follow that. In any case we never let it go longer than a year in Hawaiʻi's salt water.
What is the idle speed of a Suzuki DF300?
600 to 700 r/min (650 ± 50; in-gear approx. 650), controlled by the electronic throttle; no adjustment screw.
What is the propeller nut torque on a Suzuki DF300?
55 N·m (5.5 kg-m, 40.0 lb-ft), then the cotter pin.

Maintenance specs

Engine oilAPI SE, SF, SG, SH or SJ, or NMMA FC-W, SAE 10W-40 or NMMA FC-W 10W-40
Engine oil quantity8.0 L (8.5/7.0 US/Imp. qt) oil change only; 8.2 L (8.7/7.2 US/Imp. qt) with filter
Engine oil filter14 N·m (1.4 kg-m, 10.0 lb-ft), 3/4 turn
Engine oil drain plug13 N·m (1.3 kg-m, 9.5 lb-ft), new gasket
Gear oilSuzuki Outboard Motor Gear Oil or SAE #90 hypoid gear oil
Gear oil quantity1,100 ml (37.2/38.7 US/Imp. oz)
Gearcase leak test100 kPa (1.0 kg/cm², 14.2 psi)
Spark plugNGK BKR6E, qty 6
Spark plug gap0.7 to 0.8 mm (0.028 to 0.031 in)
Spark plug torque28 N·m (2.8 kg-m, 20.0 lb-ft)
Idle speed, neutral600 to 700 r/min (650 ± 50; in-gear approx. 650), controlled by the electronic throttle; no adjustment screw
ThermostatOperating temperature 58 to 62 °C (136 to 144 °F)
Propeller nut55 N·m (5.5 kg-m, 40.0 lb-ft), then the cotter pin
Tappet clearance, coldIN 0.23 to 0.27 mm (0.009 to 0.011 in); EX 0.33 to 0.37 mm (0.013 to 0.015 in); adjusted with tappet shims

Service schedule

The factory maintenance intervals, with what is replaced and what is checked at each. Rows marked Hawaiʻi are our shop's yearly service for salt water use.

  1. Initial 20 hours

    Replace: engine oil, oil filter, oil drain plug gasket, gear case oil, gear case plug gaskets, propeller cotter pin

  2. Every 50 hours

    Replace: gear case plug gaskets

    Check: fuel filter, anodes

  3. Every 100 hours

    Replace: engine oil, oil drain plug gasket, gear case oil, gear case plug gaskets, propeller cotter pin

    Check: spark plugs, fuel filter, anodes

  4. Every 200 hours

    Replace: engine oil, oil filter, oil drain plug gasket, spark plugs, gear case oil, gear case plug gaskets, propeller cotter pin, water pump impeller

    Check: fuel filter, anodes

Source: Suzuki DF300 service manual. Specs can change by model year and serial number, so always confirm your exact model from the serial tag on the clamp bracket.

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