I just bought a 1988 yj 4.2 6I and gave it a fresh oil change, it said it was right on the "add line" before the change, I pulled the plug and the filter and let it all drain, for 20-30 minutes. Only got around 4.5 quarts out. Which seemed odd.
New filter, added 5 quarts first and it measured fine and dandy on the dipstick. Ran it, and the oil pressure
was way past halfway?! And after the dipstick seemed to suggest it has an extra quart in it! So I let it sit a day and the dipstick reads normal but as soon as I run it the pressure goes all the way up and the dipstick shows extremely high again. Isn't the capacity supposed to be 6 quarts? Do I drain it and refill with less? Does I have a bad air bubble I need to get out? The old oil was pretty filthy, but I ran it beforehand and let it drain for quite a while.
New filter, added 5 quarts first and it measured fine and dandy on the dipstick. Ran it, and the oil pressure
was way past halfway?! And after the dipstick seemed to suggest it has an extra quart in it! So I let it sit a day and the dipstick reads normal but as soon as I run it the pressure goes all the way up and the dipstick shows extremely high again. Isn't the capacity supposed to be 6 quarts? Do I drain it and refill with less? Does I have a bad air bubble I need to get out? The old oil was pretty filthy, but I ran it beforehand and let it drain for quite a while.
