[zenmaster]

Originally Posted by reb03

Maybe I need to rephrase my question and my intention is not to start a pissing match. I’m simply looking for opinions as to whether fuel dilution, rapid shear and low flashpoints should be a concern for longer term engine health/life?

I'd check for more data points as one guy's sample doesn't show a trend. You may also want to talk with the guys at Dyson or Blackstone.

[RMRC]

Originally Posted by e.n335

and use Castrol edge.

- Eugen

Do you use the 0w30 edge? We can get that at Autozone over here.

[e.n335]

Originally Posted by reb03

Do you use the 0w30 edge? We can get that at Autozone over here.

+1

[radgator1]

Originally Posted by bnj

Does anyone have a healthy report after 15k?

Looks like we can't get a healthy report after 1250 miles according to the OP so what the hell are we supposed to do, biweekly oil changes?

[HPIA4v2]

Originally Posted by reb03

The N54 appears to kill oil in as little as 1,000 miles. Fuel dilution is the problem and is common in most new US direct injection engines, including the RS4. Take a look at the fuel % readings and the related flash points (see link) of four test samples after just 1,000 – 1,250 miles (240, 280, 225 and 255). With the engine’s normal operating temp is 240 this can't be good. Any engineers, chemists or tuners on the board care to comment?

http://theoildrop.server101.com/foru...e=0#Post982527

I am not stiring the pot here just wonder, are you talking unburn fuel gets into the oil or the by-product of fuel gets into oil?
All engines will have the later, that's why engine oil gets dark after 1000 miles.
Direct Injection is proven to burn cleaner (all fuel is practically burned, since the high pressure pump atomized the fuel around the spark plug instead of filling the entire cylinder ala old fuel injection engine). So how can more fuel gets into oil if all of them get burned?

[6Zylinder]

Originally Posted by HPIA4v2

I am not stiring the pot here just wonder, are you talking unburn fuel gets into the oil or the by-product of fuel gets into oil?
All engines will have the later, that's why engine oil gets dark after 1000 miles.
Direct Injection is proven to burn cleaner (all fuel is practically burned, since the high pressure pump atomized the fuel around the spark plug instead of filling the entire cylinder ala old fuel injection engine). So how can more fuel gets into oil if all of them get burned?

You nailed it! I want to know to.

[RMRC]

Originally Posted by HPIA4v2

I am not stiring the pot here just wonder, are you talking unburn fuel gets into the oil or the by-product of fuel gets into oil?

Unburned fuel. I read over on the bobistheoilguy site that it's due to the high pressure. DI engines run injector pressures of between 1000 and 2500 psi (don't know what the 335 psi is) that can cause fuel washdown through the rings. My 9k mile oil with no previous changes (it's a lease) is being analyzed right now. I'll post up the results when I get them.

[RiXst3r]

Originally Posted by bnj

Does anyone have a healthy report after 15k?

I have almost 10k with zero consumption. Stilll reads "MAX"

Oil was changed at 1500

[itsbrokeagain]

same here. I treat my car nicely and change the oil every 5k. never had an issue of having to top off and you can still see through my oil when I drain it. Little brown but good to me..I use the standard bmw stuff but I will switch out for the castrol 10-60 once track time comes around.

[leftcoastman]

JEEZUS! Once and for all, reb03 is not talking about oil CONSUMPTION. He is talking about oil DEGRADATION.

If the N54 really does take a dump on oil (degrades it), you should be happy if your car consumes a lot of oil. That way, you refresh it with new oil constantly.

http://neptune.spacebears.com/cars/stories/mobil1.html

Scroll down to "The Effect of Top-Up Oil".

reb03 - Last time I took her on track, I had 3000 miles on the Mobil1 0w40. Got the oil temps near 290. Luckily, the oil didn't ignite! I'm definitely gonna change my oil before the next track day. Yikes.

[ArmyBimmerDude]

Changed the oil at 1000 miles. I'm almost at 8000 miles now and the oil level is at its minimum. Turning the car in today for an oil change. I figure a change every 5-7k miles is good.

[hotrod182]

Originally Posted by itsbrokeagain

same here. I treat my car nicely and change the oil every 5k. never had an issue of having to top off and you can still see through my oil when I drain it. Little brown but good to me..I use the standard bmw stuff but I will switch out for the castrol 10-60 once track time comes around.

Does anyone know if the 10-60 motorsport oil is BMW factory approved? I heard one of the BMW engineeers personally recommended it off the record.

[mayno]

Originally Posted by reb03

Unburned fuel. I read over on the bobistheoilguy site that it's due to the high pressure. DI engines run injector pressures of between 1000 and 2500 psi (don't know what the 335 psi is) that can cause fuel washdown through the rings. My 9k mile oil with no previous changes (it's a lease) is being analyzed right now. I'll post up the results when I get them.

my guess is that the oil analysis will come out fine despite using the same oil for 9K. i'm curious to know how hard you drive your car. i also would like to see someone do an oil analysis at 5K and another person at 15K and see all of the differences. that would tell a complete story.

[sdiver68]

Unless the oil is sampled correctly, fuel ratio will test falsely high. I would suspect faulty sampling methods first, as there has been plenty of 335's running hard at track days and no engine fires that we've heard of.

[bnj]

Originally Posted by RiXst3r

I have almost 10k with zero consumption. Stilll reads "MAX"

Oil was changed at 1500

In that case you have not been able to enhance the quality by adding new oil. You are left with changing your oil asap. as the only way to stop the degradation.

[bnj]

Originally Posted by reb03

Unburned fuel. I read over on the bobistheoilguy site that it's due to the high pressure. DI engines run injector pressures of between 1000 and 2500 psi (don't know what the 335 psi is) that can cause fuel washdown through the rings. My 9k mile oil with no previous changes (it's a lease) is being analyzed right now. I'll post up the results when I get them.

Great! I'm really interested to know the results.

[bronco]

Originally Posted by RiXst3r

I have almost 10k with zero consumption. Stilll reads "MAX"

Oil was changed at 1500

What oil are you using?

[dxb335d]

as long as you never let it run low, whats the prob?

[lawdude]

Originally Posted by dxb335d

as long as you never let it run low, whats the prob?

Dilution according to the OP.

[leftcoastman]

Originally Posted by dxb335d

as long as you never let it run low, whats the prob?

See post 32 for clarification.

If the oil is getting diluted, you WANT your car to consume oil.

[turbodan]

Originally Posted by reb03

Unburned fuel. I read over on the bobistheoilguy site that it's due to the high pressure. DI engines run injector pressures of between 1000 and 2500 psi (don't know what the 335 psi is) that can cause fuel washdown through the rings. My 9k mile oil with no previous changes (it's a lease) is being analyzed right now. I'll post up the results when I get them.

Dude-STFU. BMW didnt design the injectors in the N54 to blast fuel agaist the side of the cylinder. The direct injection is far less likely to dilute the oil because it runs leaner mixtures, and the fuel mixture is injected directly into a specially designed combustion chamber with the intake air already compressed and the piston approaching TDC. The actual injection and ignition takes place in the crown of the piston. Traditional port injection draws in air and fuel on the intake stroke, which causes far more washdown and oil contamination than the direct injection in the N54, which draws in pure air on the intake stroke. Fuel isnt even involved until the intake air is fully compressed.

I dont know what you read, or what applies to Audi's engine, but you need to really check your facts and do some reaserch before you get on here and start spouting off BS about oil contamination and design flaws. Why do you give BMW's engineers so little credit? You clearly dont understand anything about BMW's high precision direct injection or the N54 in general.

[RMRC]

Originally Posted by turbodan

I dont know what you read, or what applies to Audi's engine, but you need to really check your facts and do some reaserch before you get on here and start spouting off BS about oil contamination and design flaws. Why do you give BMW's engineers so little credit? You clearly dont understand anything about BMW's high precision direct injection or the N54 in general.

I never claimed to have a superior working knowledge of the BMW direct injection engine nor did I say anything about engineering design flaws. I was bringing to light what may be a problem and was asking for opinions from those who may know more about it.

Terry Dyson of Dyson Analysis knows a thing or two about Direct Injection and how it works. He claims the N54 is destroying every oil he’s tested and fuel dilution appears to be the problem. I’d venture a guess that he probably knows a bit more about it than you but I don’t know your background.

I asked Terry how unburned fuel is getting past the rings and he replied: “Fuels interrupt ring seal because they are not lubricious and in fact interrupt the films the oil must have on rings and cylinder walls or all heck breaks loose.”