All the trim levels use basic 10w-30.sorry pal you are wrong the tt uses 10.30 whereas the non turbo uses 10.40
FOR MOST AMBIENT TEMPERATURE RANGES 10w/40 FULLY SYNTHETIC ENGINE OIL IS SUITABLE FOR THE MITSUBISHI GTO 3 LITRE V6 TWIN TURBO
engine oil capacity is 4.3 liter including 0.3liter in oil filter. 1990 - 1994 models GTO
FOR MOST AMBIENT TEMPERATURE RANGES 10w/40 FULLY SYNTHETIC ENGINE OIL IS SUITABLE FOR THE MITSUBISHI 3000GT/GTO 3 LITRE V6 TWIN TURBO (6G72 ENGINE).
For servicing a 1991 Mitsubishi GTO non-turbo automatic, you'll need engine oil, typically a high-quality 10W-30 or 5W-30 oil depending on climate. For the automatic transmission, use a suitable automatic transmission fluid (ATF), often recommended is Dexron II or III. Additionally, check the specifications for differential oil, usually a 75W-90 gear oil. Always consult the owner's manual for specific recommendations.
Mobile One Synthetic for High Milage engines
what year GTO?, need more information to answer your question.
6.5 quarts of oil
It's on the bottom of the oil pan.
The filter is somewhere underneath the skid plate in the front of the car...
Oldsmobile V8/1962 TO 1977
SAE 10w30
IF ITS NOT LOW ON OIL IT MOST LIKELY IS AN OIL SENDING UNIT .YOU MAY WANT TO HAVE SOMEONE LOOK AT IT ...THE SENDING UNIT COULD START PUKING OIL AT AND TIME IF ITS BAD