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It's all speculation if it hasn't been tested to a specific industry spec. Euro and U.S. oils of the same or similar name can be completely different formulas so never assume anything without proper oil certification/approval. It's virtually impossible to tell if any oil meets or exceeds an oil...

That's cool. I meant VW OCIs but if the used oil analysis shows it's good, then it's good.

Yes, unfortunately VW and other car makers will void your warranty for not using the proper approved oil for your engine as it is a warranty requirement. It's not ill behavior, it's VW knowing what oils properly lubricate your engine and specifying those oils so you can properly protect your...

Without actual engine testing to the BMW LL-01 oil test sequence no one can determine what oil is best for this application. Any BMW LL-01 approved oil of the proper viscosity should serve you well however. A used oil analysis will tell you the proper OCI if in doubt.

Without actual controlled engine testing it's impossible to objectively state that one oil is better than another at lubricating an engine. A UOA is intended to tell you the proper OCI not if one oil lubricates better than another. People often use a UOA for the incorrect purpose as Doug Hillary...

UOA is for determining the proper OCI, oil contaminates and if a mechanical issue exists in the engine. A UOA can not tell you if one oil lubricates better in your engine than another. You need to run the oil test sequence like the A3/B4 or car mfg.'s oil test sequence to determine the oils...

I don't recall the Castrol SLX Pro OE ever being recommended for OCIs longer than 7,500 miles.

Any VW 502 approved oil of a 5W-40 viscosity should serve you well. A used oil analysis will tell you how often to change the oil or change it once a year to be safe with the short runs/low mileage.

The UOA article by Doug Hillary. READ this link to properly understand what a UOA can and can not tell you People often use the UOA for the incorrect purpose.

Audi requires only 505.01 oils in their RS engines so they may be your best choice based on actual engine testing by Audi? Just an FYI that a used oil analysis can't tell you if one oil lubricates your engine better than another as Doug Hillary's article at the link below explains. A used oil...

OP- Any VW approved 502 spec oil of the correct viscosity should serve you well. No one can tell you if one oil lubricates your engine better than another without actual engine testing.

I didn't say Euro oils were "special". I said you can't tell how well an oil actually lubricates an engine without conducting the oil test sequence as car makers do on the specific engine and oils. A UOA does not tell you how an oil performs in the engine as Doug Hillary's UOA article explains...

OP- If your vehicle is still under warranty and you care about the warranty then I'd use an approved VW 502 oil. If your vehicle is out of warranty and/or you don't care about your warranty then you can pick any oil that you like but the problem is no one can tell you which oil is "best" for...

At 91K you could have valve stem seal, guides and possible piston ring issues causing an increase in oil consumption. VW recommends 5W-40 on the newer models so I'd try that to start. While Mobil 1 oils have been known to have higher consumption rates in many engines, that may not be the...

How can anyone possibly know if a Euro or any other oil is appropriate or superior to another oil without actual oil test sequence testing in the engine of discussion? If you're not conducting the expensive and time consuming oil test sequence for a given engine such as the VW 502, BMW LL-01, MB...

Amsoil is not VW 502 approved. AFAIK Amsoil has no Euro car maker oil approval and very limited API approval on only a few products. That being said a UOA can not tell you how any oil actually lubricates your engine. To determine actual oil performance in your engine you need to conduct the...

The only way you would know how well an oil actually performs in your engine is by conducting the appropriate oil test sequence like car makers do, i.e. VW 502.00 in this case. I would use the oil required by your new vehicle warranty if you value your warranty and engine. Without actual oil...

Motul's website is horrible in my experience for finding product and tech info. FWIW, the two oil formulations seem to be different based on the data you posted if you check viscosity, density, etc. A pour point around -38 F would be typical for a good synthetic 5W in my experience but you...