These bearings are manufactured using common rod bearing materials instead of the harder metals of the latest factory BMW bearing shells.
It seems that at some point BMW changed the metal materials in the S85 10 rod bearings to a harder mix of tin-aluminum. The commonly-held belief is that BMW did this to make S85 rod bearings last longer after many complaints of "premature" bearing wear (there actually is no published spec for bearing life). The standardized materials for rod bearings are lead-copper, which as they break down, give a solid indicator of rod bearing wear when doing oil change analysis. The new BMW materials do not show up in analysis as easily (or at all). Another major drawback to the harder materials is that if oil starvation occurs and bearing-to-crankshaft contact occurs, the new bearings are more likely to damage the crank.
A popular alternative to new factory bearings are these bearings made of lead-copper by the OEM supplier to BMW, Clevite. These bearings use the industry-standard materials so that bearing wear is easily calculated in oil analysis and the softer material is less likely to damage the crankshaft. The sizes and clearances have been carefully chosen, after consulting with engine-building experts, to work with the factory BMW 10W60 engine oil. These bearings are custom made by Clevite specifically for V10 model M5 or M6 enthusiast owners who demand an alternative to the factory BMW bearings. They are not designed to last longer than any OE BMW bearing, just optimized based on BE's research. There is no official replacement interval from BMW but we feel comfortable recommending a preventative replacement at 80,000 miles
These bearings are sized for a standard crankshaft that has not been machined. They are a direct alternative replacement for BMW part numbers 11247841703 and 11247841702, as used in all 2006, 2007, 2008, 2009 and 2010 model BMW M5 and M6.
Note: connecting rod bolts cannot be re-used. They are stretch-to-yield and must be replaced. BE also offers stronger ARP rod bolts that resist rod bore deformation better than stock bolts.
Price is for the set of 20 bearings for the V10.
Engine Oil Note: these bearings have been specifically designed for use with BMW 10W60 oil. While we strongly recommend Red Line we have not evaluated these bearings with Red Line oil so our best recommendation is the factory 10W60. Correct oil operating temperature is 220°F - you should properly warm your engine before subjecting it to higher throttle angles and RPM. For more info on engine oil in general, check out our Oil Tech Page by clicking here.
BMW Fitments: 5 Series
E60 / E61 (04-10) > M56 Series
E63 / E64 (04-10) > M6