This has been discussed a lot. When I brought mine home, the first thing I did was check the oil level. It was a bit over the full mark; so, that's where I fill it to...about 6.5 qts
I had a bad experience with UPR. I subsequently decided it's not money well spent. I would have been better to keep the factory plug and save the money
If you'll notice, there's a small set screw on the side. Its not designed to come out, but is there as a detente. I had to use a vice and channel locks to break it open passed it the first time. I complained to UPR but they were no help. They would not even consider accepting a return unless it...
I don't know much about newer motors, but my mechanic says oil is used for more than just basic lubrication. I intend to use mobil1 only. I'd be nervous about any additives.