Parts for your 1998 Nissan Navara-Transmission fluid

1998 Nissan Navara transmission fluid — what it does and how to look after it

Transmission fluid absolutely applies to the 1998 Nissan Navara. Technical sources like the Nissan D22 Navara Factory Service Manual (AT and MT sections) and the 1998 Owner’s Manual specify fluid for both gearboxes fitted to this model: the automatic (e.g., RE4R01A) uses automatic transmission fluid meeting Nissan Matic-D/Dexron III, while the 5-speed manual (e.g., FS5W71C) uses a dedicated manual gearbox oil to API GL-4, typically 75W-90. So, whether it’s auto or manual, there’s a specific transmission fluid in play that needs the right spec, level and service interval.

What’s it there for? In autos, ATF does a tonne of jobs: it lubricates moving parts, acts as the hydraulic medium for shifts, cools the transmission, and keeps varnish and wear at bay. In manuals, the correct GL-4 oil protects gears and bearings, cushions synchros for smooth shifts, and resists shear and heat. Use the wrong stuff and you can cop notchy changes, slipping, overheating, or even premature wear.

For the 1998 Navara automatic, a drain-and-fill at regular intervals helps keep shift quality and temperature control on point. The factory literature and industry practice commonly point to 40,000–60,000 km or 2–4 years for moderate use, sooner if towing, off-roading or working in hot conditions. Many workshops prefer multiple drain-and-fills over machine flushes on older autos to gently renew fluid without shocking the system.

For the manual, fresh GL-4 75W-90 at around 60,000–100,000 km (shorter if worked hard) maintains synchro performance and gear protection. Avoid GL-5 unless the bottle explicitly states GL-4 synchro compatibility—standard GL-5 can affect yellow-metal synchros.

• Always match the spec: Auto = Nissan Matic-D/Dexron III, Manual = API GL-4 75W-90.
• Checking level: autos use the dipstick with the vehicle hot and idling in Park, manuals are checked at the filler plug—the oil should be at the lower edge of the hole.
• Watch for red/brown ATF turning dark or smelling burnt, or manual oil with metallic sparkle, both are signs it’s due.
• Replace crush washers, torque plugs correctly, and inspect for leaks at the sump/pan, cooler lines (auto), and seals.

Done right, the Navara’s transmission fluid quietly protects the box, keeps shifts tidy, and helps the old D22 stay dependable for many more kilometres.

Popular questions about 1998 Nissan Navara transmission fluid

What transmission fluid does a 1998 Navara take?

It depends on the gearbox. Automatics take ATF to Nissan Matic-D/Dexron III spec. Manuals use API GL-4 75W-90 manual transmission oil for proper synchro protection. The Nissan D22 Factory Service Manual and Owner’s Manual detail these specs and shouldn’t be mixed or substituted with “close enough” alternatives.

How often should the transmission fluid be changed?

For autos, plan on 40,000–60,000 km or 2–4 years, shorter if towing, off-road, or in hot stop–start use. For manuals, 60,000–100,000 km is a practical window. Service history, driving conditions, and fluid condition (colour, smell, contamination) can justify earlier changes.

How do you check the transmission fluid level?

Automatic: on level ground, at operating temperature, engine idling in Park, cycle through gears, then check the dipstick against the HOT marks. Manual: with the vehicle level, remove the fill plug, the oil should be just at the lip. Always use new washers and correct torque when refitting plugs.