Originally Posted By: Twilight_Blue_G35c
...Would using Redline in between the dealership scheduled oil changes help at all? (draining the BMW oil half way through the interval?)
I think the deposit issue cannot be readily fixed with oil choice. I believe oil choice may help the problem but won't solve it. F.e. Mobil 1 0W40 I think is generally recognized as being good at deposit control. The above 100k photo was a car that used M1 0W40 every 10k miles.
As part of a battery of measures to combat deposits, using a low volatility oil and good cleaning oil makes sense I think. Do properties of ester-containing oils such as redline and biosyn make a difference? That is the question and hard to answer I think. Some things to think about:
In Rl_RS4's work, he thinks that Renewable lubricants Biosyn helps with deposit formation due to low volatility and cleaning ability. I haven't researched it enough to know this is true but he has put a tremendous amount of work into the issue and I would encourage anyone to track down his work on audi RS4 engines. I would love to see some solid before and after comparisons of Biosyn deposits vs other oil deposits.
I find this CRODA slide interesting as valves get tremendously hot (as much as 380C in the 2.0 FSI).
If the above indicator is true, it does make one think that oil choice may influence deposits. VW's patent seems to indicate that they rely on typical driving habits to "burn off" the valve deposits. But wouldn't the high temps actually increase the type of deposits shown in the CRODA slide? That is why I say the overall question is hard to answer.
IMO eliminating the source of the problem by no return to the intake is the only sure-fire method. Barring that, combining as many of the above listed treatment/preventative measures as possible would be wise I think. I have been impressed in particular with cars that have received the induction service. For those preventative measures I think starting early is important.
...Would using Redline in between the dealership scheduled oil changes help at all? (draining the BMW oil half way through the interval?)
I think the deposit issue cannot be readily fixed with oil choice. I believe oil choice may help the problem but won't solve it. F.e. Mobil 1 0W40 I think is generally recognized as being good at deposit control. The above 100k photo was a car that used M1 0W40 every 10k miles.
As part of a battery of measures to combat deposits, using a low volatility oil and good cleaning oil makes sense I think. Do properties of ester-containing oils such as redline and biosyn make a difference? That is the question and hard to answer I think. Some things to think about:
In Rl_RS4's work, he thinks that Renewable lubricants Biosyn helps with deposit formation due to low volatility and cleaning ability. I haven't researched it enough to know this is true but he has put a tremendous amount of work into the issue and I would encourage anyone to track down his work on audi RS4 engines. I would love to see some solid before and after comparisons of Biosyn deposits vs other oil deposits.
I find this CRODA slide interesting as valves get tremendously hot (as much as 380C in the 2.0 FSI).
If the above indicator is true, it does make one think that oil choice may influence deposits. VW's patent seems to indicate that they rely on typical driving habits to "burn off" the valve deposits. But wouldn't the high temps actually increase the type of deposits shown in the CRODA slide? That is why I say the overall question is hard to answer.
IMO eliminating the source of the problem by no return to the intake is the only sure-fire method. Barring that, combining as many of the above listed treatment/preventative measures as possible would be wise I think. I have been impressed in particular with cars that have received the induction service. For those preventative measures I think starting early is important.