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I’d either run the factory fluid, or a GL-5 oil. Also remember too the differential gears see extreme pressures and may need a GL-5 unless they performed acceptably for the validated factory fluid. Unless this is for a transaxle. The GL-4 because of the Syncro material

I spoke with someone at my work who specializes in torque vectoring axles and wet clutches. He mentioned that OEM's are usually quite picky with the friction modifier formulations and concentrations for wet clutches. I'm sure this BG Syncroshift MTF does not meet whatever the TF0780 spec is. I...

I’m sure majority of those requirements revolve around the slipperiness and quality of additives so it does not break down quickly with heat (towing/aggressive driving) and the wet clutch friction characteristics are as designed.

Good information here. The service manager I spoke to stated he’s been there 13 years and they like to change the drivetrain fluids at 50k to prevent future problems and failures. I assume he’s seen thousands of BMWs come through and hundreds get this service. I assume if it was a problem they...

I’m yeah that’s what they said. The invoice says Customer requested the driveline service.

Yeah BMW of Ann Arbor, MI. Surprised as hell to hear that.

I looked into that a bit. Nothing wrong with using he 75w-140 for the axles. Nothing special about them to require a special BMW lube. Actually the thicker oil is better for wear protection. Just loosing probably 1-2% efficiency from the higher pumping and churning losses in the gears and...

On the diff fluids, the part numbers and prices were for the 64 fluid oz each and each diff takes less than a liter haha. Scam dealer!

Hello! Recently bought a 2017 BMW X5 with 50k miles on it. About 4 months ago the previous owner got a 50k miles service done at the dealership. Upon closer inspection to what was actually performed on the vehicle, it looks like the dealer used BG products from the front and rear differentials...

Yeah I think that is exactly how it was operated by the previous owner. The car will see a ~3K OCI with extended highway drives and track use. Short trips below 10 miles will be infrequent. We will see again in the fall!

Nice video. When drive line components like axles and gearboxes are developed. It is standard process in automotive to make a clear carrier/housing to evaluate oil flow on a bench and compare to CFD models. Different temperatures, speeds, and angles are considered. These clear parts are...

https://rennlist.com/articles/pfaff-racings-porsche-911-tests-oil-samples-from-rolex-24-at-daytona/ You got it!

Hello! Car is a 2010 Porsche Cayman S 3.4L DFI 6MT. Bought this in October 2021 and changed the oil in December. Previous owner stated the last oil change was performed by a local shop in April. Sold the car because he didn't drive it much anymore. With low wear and fuel dilution, I think the...

https://rennlist.com/forums/997-forum/1075354-introduction-motul-6.html Post #87 Motul also posted "introductions" on many different sub-categories on Rennlist that might be worth digging through.

I did some research on Rennlist on Motuls replies to other members who use their vehicles in a similar manner. Motul recommends 3,000 miles in a street application with casual track days. I'm not trying to maximize fuel economy, OCI, emissions, or any other compromises oil and additive package...

Good thought. Perhaps consider engineering an engine that has typical 1yr/10k OCI but with a smaller oil sump. Kind of the theory "as little as possible, but as much as necessary". This would also reduce weight, and probably windage losses creating a more efficient engine package.

Ended up going with the 300V, love the packaging here. Using the LIQUI MOLY Hybrid additive over winter to keep the fuel stabilized since I don't drive the car very much. Spark plugs, belt, and MAF cleaner. I have a Blackstone kit, gonna do a UOA of whatever is in the sump currently.

No oil monitor here! Not as fancy as BMWs lol

True, do you think that is because of the extended drain intervals targeted by OEMs and that Motul might know this and not even try to spend the money for the testing?