So I was due an oil change like a week ago. Of course I run OEM filter and Mobile 1 advanced full synthetic 5w-30. Drained oil for about 45min then added my 5qts. I knew I was lacking .5 qts roughly so this past Sunday I added .5qt of MMO thinking it couldn't hurt, being that it's at 120k miles. Well I thought all was good until today I noticed some splatter on the LCA. I get under the truck and oil is splattered under the front of the truck. Looks like it's coming from crankshaft main seal. But I'm worried it's the pan. Anyways, is this normal after adding MMO? And how much should I expect to pay for this repair?