i loaned my 95 skylark with a 3100 engine and he ran it low on oil . the engine shut down and after a half hour he started it back up and drove it another twenty miles home with the rod knocking and didn't tell me for a month and then only because a asked about it. he told me well you didn't give me any oil and i didn't know what that light meant so i kept on driving doh i had it towed to my house and started it just long enough to confirm the problem. is it possible to put a 3.8 liter in place of the 3100? its a nice car no dents no bad paint. i would like to keep the car as it is really comfortable. and if i fix the bottom end of the 3100 i might as well fix the whole thing the only other problem is it is an obd 1.5 they only made them for a year or two just to tick people off.