BMW high performance engines have had a near 20 year record of having rod bearing issues. In the pursuit of HP and minimizing internal friction, they have narrowed the bearing from the legacy rod bearing that didn't have any issues. There were also come clearance issues for a period form 2003-2013. This combined with the fact that the HP/cylinder continues to climb makes me nervous on my current engine, the S55 (M3/M4). The did increase the bearing width over the last two generations, but still isn't as wide as the older bearings. The factory oil recommended is a 0W-40, and I'm currently running the Castrol Edge 0W-40 A3/B4 oil.
I've seen a hand full of posts were rod bearings were already replaced at 30,000-60,000 miles with a lot higher wear that I would expect. I'm running this because during my initial research, this looked like it had a higher percent of group IV oil, where Mobil 1 0W-40 FS was group III. Not 100% sure since all of this is hard to pin down. My first oil analysis got lost, and I'm due for an oil change. I drive the car EXTREMELY hard, and eventually plan to modify it running E85 adding 150+ hp over the stock output.
I saw Mobil's 0W-50 racing oil and it has me thinking. Anyone on here run Mobil 0W-50 on a newer vehicle on the street? I'd like the higher film strength of the 50 weight, but that comes with extreme levels of zinc and phosphorus. Can Mobil 1's oil has generally said it is safe to run and blend with other oils. Thoughts on substituting a quart or two of the 0W-50 in the next oil change if I switch to Mobil 1 0W-40 FS? Any other oils I need to be considering? I run 15W-50 in my older turbo BMW, but concerned with the large difference in the 0W vs 15W, but would like the little extra zinc and phosphorus that it comes with.
Let me know your thoughts, thanks.
I've seen a hand full of posts were rod bearings were already replaced at 30,000-60,000 miles with a lot higher wear that I would expect. I'm running this because during my initial research, this looked like it had a higher percent of group IV oil, where Mobil 1 0W-40 FS was group III. Not 100% sure since all of this is hard to pin down. My first oil analysis got lost, and I'm due for an oil change. I drive the car EXTREMELY hard, and eventually plan to modify it running E85 adding 150+ hp over the stock output.
I saw Mobil's 0W-50 racing oil and it has me thinking. Anyone on here run Mobil 0W-50 on a newer vehicle on the street? I'd like the higher film strength of the 50 weight, but that comes with extreme levels of zinc and phosphorus. Can Mobil 1's oil has generally said it is safe to run and blend with other oils. Thoughts on substituting a quart or two of the 0W-50 in the next oil change if I switch to Mobil 1 0W-40 FS? Any other oils I need to be considering? I run 15W-50 in my older turbo BMW, but concerned with the large difference in the 0W vs 15W, but would like the little extra zinc and phosphorus that it comes with.
Let me know your thoughts, thanks.