had BUTLER PERF. do my engine back in jan.since then i have been driving it,about a week ago i noticed a little oil on my garage floor so i jacked it up and took of the converter cover and found some oil laying In the bottom of the cover It looks like the oil is coming from eather the rear pan or the rear main.?I only have about 300 miles on the engine and they did put a viton seal in the rear main.If it is the rear main what all is intailed on changing the seal. and trust me I wont be doing it, I will take it to a shop that i know and have it replaced at butlers expense.!