Yes the rotating assembly of the IP is lubed by engine oil. The barrels, however, are susceptible to wear due to low sulfur fuel. The first sulfur decrease was about '92 or so. At that time, I bought a case of cheap, but new 30W oil. I put just a few ounces of oil with every fill up. That pump is still in good shape.

With even more sulfur coming out of the fuel, you will definitely need to add 2 or 3 ounces of oil with every fillup. It doesn't sound like much, but it will be enough.

Good luck,