E90 M3 S65 engine connecting rod bearing replacement

We get randomly the inquiries to update or replace the E90 M3 S65 engine connecting rod bearings. What is the issue at hand, clients ask?

Please keep in mind this is one of the best high reving normally aspirated V8 engines ever built, one of my personal all time favorite. We recommend to disect the oil filter after every oil change just like every experienced Porsche technician used to or still does on the early flat six water cooled Porsche engines, looking for small metallic pieces is the key in here.

The S65 engine is a purpose built race prepped engine with a rather high rpm which will take its toll on the top half of the relatively skinny connecting rod bearings over time. This engine in various iterations were used by BMW for 12 years as their motor sport engine of choice for all of their race cars on their factory teams.

We recommend to use only the best 10/60 fully synthetic motor oils like Liqui Moly and supplement it it with the Lm2009 Mos2 additive which is a super fine almost molecular fine graphite substance potentially can help the bottom end bearings to be more resilient over long term.

Here are some pictures to see how the removed bearings look alike if removed, replaced in time.

This particular S65 had a hundred fifty thousand kilometers of spirited driving until this point. Naturally timely oil changes will also help in the long run, it’s rather simply just standard common sense.

I also included a disected oil filter from the same engine. Naturally a pair of sharp eyes are an absolute must to catch this issue at hand and address it in a timely manner.

Any questions? Telephone: (1) 905.795.0419


Liqui Moly Line Of Lubricants & Additives

Lubro Moly – Liqui Moly – Line Of Lubricants And Additives

Auto Bild, auto motor and sport and Auto Zeitung readers have selected LIQUI MOLY (used to be LUBRO Moly) to be their favorite brand of lubricant.

Auto Bild German Automotive MagazineIn 2012 the motor oil and additive expert LIQUI MOLY was again voted to be Germany’s favorite brand of lubricant. In the Auto Zeitung and auto motor and sport reader polls.

The German company  achieved first place again in the lubricant category, defending its title earned the previous year. Auto Bild polled its readers for the first time. Here as well the majority gave LIQUI MOLY first place.


LIQUI MOLY GmbH from Ulm in South Germany offers a wide range of qualitative high-quality products such as motor oils, additives, vehicle care products and service products. The range includes some 4000 items.

LIQUI MOLY develops and tests their products in their own laboratories, manufactures exclusively in Germany and markets all of their products themselves.

LIQUI MOLY was founded some 50 years ago and is now one of the leading companies in the industry. The products are sold in Germany and in 100 other countries, include Canada.

We at Techmax, Auto Repair Inc. use LIQUI MOLY‘s products too and we love them. More information….


LIQUI MOLY (German motor oil and additive specialist, well know it’s Liqui Moly synthetic motor oils line) emphasizes their additives being effective. So they asked the independent German test facility APL to run a series of tests with LIQUI MOLY additives.

APL certified that additives really help against friction and fuel consumption. They tested Cera Tec, Injection Cleaner and Super Diesel Additive – with astonishing results.

Cera Tec is a high tech oil additive containing tiny ceramic particles to protect the engine and to reduce wear. It was tested for its seizure protection properties. One gear wheel drove another one under constantly increasing load until the wheels reached a certain degree of wear. The standard oil reached level four, the same oil with Cera Tec reached level nine. This underlines the excellent wear protection Cera Tec is able to deliver: The engine enjoys enhanced lifetime, experiences a lowered risk of breakdowns and due to reduced friction also fuel consumption will be reduced.

Injection Cleaner is a petrol additive to clean the injection system and the valves. For the test, two engines ran for 60 hours, one on standard fuel and the other with standard fuel plus Injection Cleaner.

During these 60 hours the first engine collected 0.3 gram deposits in each valve. Those deposits continued to grow and to impair the proper “breathing” of the engine. The second engine with Injection Cleaner remained practically clean with only 0.03 gram deposits. At the beginning of the test, the APL engineers were rather skeptical about the product. Now they use it to clean their test engines. What does it telling you?

Visit or LIQUI MOLY line of lubricants page for more info
or give as a call too: 905.795.0419