hey, i have a 91' f150 with a 5.0l, 260000 KMs. it ran great since 190000 KMs (when i bought it) now if i drive on the highway for about 20 minutes i lose 2 quarts of oil and my oil pressure gauge acts up. i noticed that my oil doesnt burn- it simply spits out of my exhaust. can anyone tell me what this is and is it fixable. thanks

 

Are there any oil puddles on the ground underneath the truck?