A factory-authorized service manual is the "bible" for your car. For the B12, professional-grade guides like those found on Scribd or detailed workshop manuals from Haynes provide:
Change brake fluid and manual transmission/differential oil. Nissan Sunny B12 Service Manual
Keeping a Classic Alive: The Ultimate Nissan Sunny B12 Maintenance Guide A factory-authorized service manual is the "bible" for
Using the correct fluids is vital for the longevity of older Nissan engines. Nissan Sunny (N13, B12) Petrol 1986-1990 | PDF - Scribd Nissan Sunny B12 Service Manual
Change engine oil and filter; rotate tires; inspect belts and hoses. Replace the engine air filter and fuel filter. Every 24,000–30,000 miles
: Essential for troubleshooting old electrical systems.