My '63 LeSabre has a 401 nailhead in it. It has always had a minor oil leak, even after being rebuilt. Part of being an old car. While we were on the road, I had the oil changed at a Buick dealership. When we got home, I noticed a massive oil leak. I checked the oil level and it was right at or just a hair above the full line. It has sat since, and when I pulled it out today, there was a lot of oil in the drip pan.
I'm taking it to a trusted shop tomorrow. My first thought is to remove the oil filter, dump it out, and drain the oil. Then go back from scratch with the proper amount. Maybe we'll see what the oil leak is when it's on the rack.
After dumping the filter and draining the oil, how much should be put in?