What's the best oil to put in a 94 mustang gt 5.0 with 90,000 miles
Four quarts of the oil called for by the manufacture. They make great high milage oil just for cars like yours. Then one quart of Lucas oil stabilizer. Do not use synthetic because it is slipperier than conventional oil and it leaks past old seals.
what the car calls for but also use oil additives like bg or stp type of stuff cause they really do work and help reduce friction for engine life...I've tried many and had great results