[John McM]

I took 7 quarts of Mobil 1 Racing 4T 10W 40 out of the system and have 15 quarts of 15W 40 Mineral high zinc Running in oil ready to go in to dilute the remaining oil and do an initial change after 20 mins at 2,000rpm.

The blurb on the pack reads, "Running In Oil has a High Zinc formulation to protect the valve train including camshafts, followers, rockers and pushrods. It allows the piston rings to bed in correctly with the cylinder walls, preventing glazing of the bores and it can be used for both dynamometer and normal road run in procedures. If used for running in on road, the suggested running in period for Running In Oil is approximately 500 Kilometres after which both the oil and filter should be changed."

I'm not sure it was only 500 Kilometres (~320 miles) for the full run in. I'll check again.

After it's run in I'll use a high zinc 15W 50 oil.