I finally sent in my first Blackstone sample at 183,000 miles and am happy and surprised at the results. The sample was on a 3,000 mile change using Delo 15w-40.
This was the final flush on an Auto Rx treatment so I expected much higher levels of contamination resulting from the flush. With this many miles and the original HG I was concerned about coolant in the oil. I have changed back to Rotella 5w-40 and will now send a sample in with every oil change to monitor.
This was the final flush on an Auto Rx treatment so I expected much higher levels of contamination resulting from the flush. With this many miles and the original HG I was concerned about coolant in the oil. I have changed back to Rotella 5w-40 and will now send a sample in with every oil change to monitor.