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AERA Technical Bulletins – September 22, 2021


12MM and 14MM Oil Drain Plugs on all 2009-2016 BMW Engines


The AERA Technical Committee offers the following information on the use of four different oil drain plugs on 2009-2016 BMW engines. These drain plugs apply to engines that have aluminum oil pans. While the original plugs were a 12MM thread, three different thread diameters may be encountered during repair procedures. 




Engine Identification for Detroit Diesel DD5 Engines


The AERA Technical Committee offers the following information on engine identification for Detroit Diesel DD5 engines. There are two different models of DD5 Engines. Some of the major visual differences between Engines are mentioned below to aid in identification. Use the information below to identify the engine properly and select correct DD5 manual, as many components change from model 934914 (S) to model 934912 (C).




What is SN Plus, LSPI and why should I care?




By now you may have heard about Low Speed Pre-Ignition (LSPI), which is an abnormal combustion event that can lead to catastrophic engine damage in Direct Injection Engines. If you don’t work on Direct Injection engines, you may be wondering why does this matter to me? Well, if you build engines that require motor oil, you better pay attention.


Since May of 2018, the American Petroleum Institute (API) has allowed licensing of a new category of motor oil called SN Plus, and the reason for this new category (API SN Plus

supersedes API SN) lies in LSPI prevention. Essentially, the previous API SN specification formulas actually contributed to LSPI because of the higher Calcium detergent content in these oils. So, to counter that, API approved and released the SN Plus specification which tests for LSPI tendency.




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Become an AERA member today and start enjoying the benefits of one of the oldest and most respected technical organizations in the world. You’ll have full access to a wealth of information, knowledge and training… plus much more!




Podcast Episode 12 – Torque Plates


Steve and Chuck take a deep dive into the why you should use a torque plate when honing the cylinder block and its importance. Also, do you know which car manufacture and model just hit the 50 million mark in sales? They will inform you as well as which engine hit the 2 million production mark in 1955. Take a listen and subscribe to the Engine Professional podcast!




Subscribe to the AERA YouTube Channel


The AERA YouTube channel features Prosis Pro tutorials, AERA webinars and membership information. We invite you to check out the wide selection of videos and subscribe! New content is added regularly.













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