This is probably just a coincidence, but my Volvo blew the main crankshaft seal while driving in the mountains of West Virginia fully loaded at high speeds. If memory serves me, I started using Mobil 1 5w30 HM at about 160K. Later I swithced to Mobil 1 0w40 at around 190K. The PCV valve was changed out within the last 6 months, so that isn't likely to be the cause.
Oil consumption was nil over a 5K OCI with high mileage oil. It reached one quart over 7900 miles on the last OCI with the 0w40. It was also down 1/2 quart at 6K miles on this oil, without hot weather or towing. It dropped another 1/4 quart after 600 miles of hot weather towing last month.
Is this just a coincidence? Should I revert back to a high mileage oil?
Oil consumption was nil over a 5K OCI with high mileage oil. It reached one quart over 7900 miles on the last OCI with the 0w40. It was also down 1/2 quart at 6K miles on this oil, without hot weather or towing. It dropped another 1/4 quart after 600 miles of hot weather towing last month.
Is this just a coincidence? Should I revert back to a high mileage oil?