Here's my 4th UOA on this engine. A little history:
- The first three were done using 5W30, the latest 10W30.
- The oil was not changed when the 2nd UOA was performed, just sampled and topped off.
- Current fill is M1 10W30 once more.
- My driving habits have changed somewhat as well, I did 90% highway when I did my first UOA and have gradually sfifted to less than 50% highwy today. And although I rarely rev to the redline (6500rpm), the engine sees 5000 rpm regularly.
1. As you can see, Blackstone is concerned about the lead wear. However I see a trend where the lead is going down; I'd like to be pleased with this, but I need reassurance from you "oildheads" that this trend is a positive indicator.
2. Iron still seems high to me, 2.5ppm per 1,000 miles. Although the iron wear is more favorable than the universal averages, I still think it's high.
3. All other wear metal levels seem to be excellent, even silicon has gone down some. If not for the iron and lead, I'd be a very happy camper.
4. I've read on other boards that this engine takes a long time to fully break in, so I plan on continuing UOAs to see if the levels of wear metals continue its downward trend.
Here's the discussion about the last UOA UOA #3
Comments and feedback are both requested and welcomed! Thanks in advance.
- The first three were done using 5W30, the latest 10W30.
- The oil was not changed when the 2nd UOA was performed, just sampled and topped off.
- Current fill is M1 10W30 once more.
- My driving habits have changed somewhat as well, I did 90% highway when I did my first UOA and have gradually sfifted to less than 50% highwy today. And although I rarely rev to the redline (6500rpm), the engine sees 5000 rpm regularly.

1. As you can see, Blackstone is concerned about the lead wear. However I see a trend where the lead is going down; I'd like to be pleased with this, but I need reassurance from you "oildheads" that this trend is a positive indicator.
2. Iron still seems high to me, 2.5ppm per 1,000 miles. Although the iron wear is more favorable than the universal averages, I still think it's high.
3. All other wear metal levels seem to be excellent, even silicon has gone down some. If not for the iron and lead, I'd be a very happy camper.
4. I've read on other boards that this engine takes a long time to fully break in, so I plan on continuing UOAs to see if the levels of wear metals continue its downward trend.
Here's the discussion about the last UOA UOA #3
Comments and feedback are both requested and welcomed! Thanks in advance.