I would highly recommend the Shell Rotella 5-40 full synthetic. You can get it at Walmart, $22 for 1gallon. It is designed for diesel engines and meets or exceeds the recommendation by VW.
Pros: designed for diesel engines
Owner reviews for engine oil
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Mobil1 ESP 5w-30. It's a 507 oil and it's available at Walmart and most auto parts stores.
Pros: available at Walmart
I bought a liter of 507 (don't use anything else) Castrol SLX, and 15K later... still haven't broken the seal or had the level go below full.
Pros: level didn't go below full
Mileage: 15000 km
Castrol EDGE Professional LL03 5W30 Engine Oil. Meets VW spec 507 and is what VW recommends.
Pros: meets VW spec
VW uses Castrol Edge 5w-40, it's what they used for mine too, i do like Castrol but not the one made here in UAE(Sharjah), therefore on my RS6 i am using Liqui-Moly Top Tec 4100(VW approved 502, 505, 505.01) which is only made in Germany and i very happy with it, therefore i am going to use it for the Phaeton as well!
Pros: very happy with it
Cons: not made in UAE
Vehicle:
Audi RS6
I've been told the magic elixir for the VR is 20w50 Amsoil Not sure I can verify that just yet but my VR is a bit quieter with it since I added it
Pros: engine is a bit quieter
Vehicle:
Volkswagen
Part number: 20W50
I am also running castrol gtx 10w40 regular oil with the Lucas oil stabilizer on my vr. I had some light smoking issues before while running synthetic and switched over and it completely stopped.
Pros: completely stopped smoking issues
Vehicle:
Volkswagen
Part number: GTX 10W40
I did notice lifter noise with the 5w-40 so decided to go with Castrol Syntec 10w-40 and it made quite a bit of difference in quieting down the lifters. I use a Mann filter. After i get the engine flushed on my VR swap using ****ty conventional oil, i'm going to run Castrol Syntec 10w-40 in it as well. Lots of people recommend 5w-40 or 0w-40 for the VR but i've found 10w-40 works well and my oil temps seldom exceed 208*.
Pros: quieted down lifters, works well
Vehicle:
Volkswagen Jetta
Part number: SYNTEC 10W-40
On all these cars I have only used one method and found that the vr6 runs the best and smoothest on castrol gtx 10w40 regular oil with an addition of one litre of Lucas oil stabilizer lubricant every 2nd oil change. I absolutely love Lucas oil stabilizer treatment for my vr6s. It is such a thick lubricant that it comes out like honey and you have to squeeze it out. I swear I can tell a difference every time I use it. In any case, back to my personal theory, I have also had throughout the years experienced long time vw technicians tell me that the vr6 12 valve motor runs optimal on regular oil. They explained to me that the vr6 motor runs optimal when using thicker grades of regular oil compared to the less thicker blends of synthetic. I have even heard some people using diesel oil for their vr6. Apparently, the vr6 likes higher viscosity type oils because they don't breakdown as easily from the heat. The vr6 likes to run hot, more then most v6, and needs a thicker oil to lubricate against breakdowns. Synthetic oils can deal with heat breakdown well too, but I just think at the end of the day it does not compare. I don't know but I have noticed a difference. The current car I have now, mk2 gti golf vr6, was apparently running full synthetic before I swapped the motor in my car. So I did a engine flush and refilled it will my personal blend of castrol gtx 10w40 regular oil with the Lucas oil stabilizer and the car ran way better. Less engine noises, smoother idling, etc.
Pros: runs best and smoothest, less engine noise, smoother idling
Vehicle:
Volkswagen
Part number: GTX 10W40
found some FORD Super Duty Diesel oil 15w40.....seems to work pretty well! ford aka motorcraft
Pros: works pretty well
Vehicle:
Volkswagen
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