How to Choose the Oil and Fluids for a Mitsubishi 3000GTby Contributor
The Mitsubishi 3000GT, as it was marketed in the United States, is otherwise known as the Mitsubishi GTO and was also marketed, with only a few minor changes, as the Dodge Stealth. These steps apply to all model years of the Mitsubishi 3000GT, from 1990 to 2001.
Use only Mitsubishi Genuine Car Care Parts Diamond automatic transmission fluid in your Mitsubishi 3000GT automatic transmission. The manual transmission requires 75W90 or 75W85 manual transmission fluid
Top off your power steering fluid reservoir as necessary with either Mitsubishi Genuine Car Care Parts power steering fluid or, in a pinch, almost any generic power steering fluid should do. Avoid the temptation to use transmission fluid unless otherwise recommended by your mechanic or Mitsubishi dealer.
Mix one part ethylene glycol antifreeze to one part clean, drinkable water--preferably distilled--and keep your radiator and coolant overflow reservoir filled to specified levels.
Refill your brake fluid reservoir as necessary with a DOT 3 brake fluid. Using other grades of brake fluid may present risks of damage to or failure of your vehicle's braking systems.
Change your Mitsubishi 3000GT's engine oil regularly, using an API certified 5W30 viscosity engine oil unless you expect to operate your vehicle in extremely high temperatures or it has especially high mileage.