WPC Treated Rod Bearing & ARP Bolt Package - E90/E92/E93 M3

Product Description

This is a set of upper and lower WPC-treated rod bearings with ARP Pro Series rod bolts for E9X M3 S65 V8 engines.

We take a standard BMW bearing shell and give it the WPC treatment, a microscopic shot-peening of the bearing -

• Removes high spots and imperfections
• Improves fatigue resistance
• Increase the surface's oil retention abilities for more lubrication
• Safer than a coating and will not decrease clearances
• Preserves the factory bearing's metallurgy

Rod bearings are a typical wear item and critical on high revving engines like the S65. The WPC treatment will prolong bearing life and reduce friction, however, bearings are still a wear item. There is no official replacement interval from BMW but we have seen and heard of high bearing wear as soon as 60,000 miles. We feel comfortable recommending a preventative replacement at 80,000 miles from stock bearings and expect a longer interval for treated bearings (data for this is still pending). Track your bearing wear with regular used oil analysis and plan on rod bearing replacement some time in your engine's future.

Bearings are sold by size. These are the standard 53.0mm inside diameter size.

This kit also includes a set of ARP Pro Series connecting rod bolts. The factory rod bolts cannot be re-used so you must purchase new bolts anyway. The ARP S65 rod bolts are precision CNC-machined to exacting specifications and designed for optimum reliability. They're thread rolled after heat treating, which gives them about ten times better fatigue strength than lower-quality bolts that are threaded prior to heat treatment. Another benefit is that ARP bolts can be re-used as long as they did not stretch during installation or use.

Price is for the set of 16 bearings and 16 bolts for the V8.

Engine Oil Note: We strongly recommend a quality oil such as Red Line because of its higher zinc content and better protection values at operating temps. For a dedicated track/race car the Red Line Racing oil has the most zinc and shear strength (but lacks the detergents desirable in street oils). 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.