[s-cars] Re: [acna_pcc] Still on 4 cylinders...

[Bruce]

The difference between a good synthetic oil 0w-40 and 15w-50 is not that 
much.  On a hot day, climbing mountains, the engine oil in my S4 will 
get up to 250 degrees F.  In the winter, I stay off the boost until the 
engine and oil warms up.  With conventional oil, one should be a little 
more concerned about the viscosity and film strength.

Bruce Cranford

Theodore Chen wrote:

>15W-50 in a biturbo S4?  that seems pretty thick.  doesn't
>audi recommend 0W-40 or 5W-40?
>
>http://www.audiusa.com/common/images/Audi_Approved_Oil_Chart.pdf
>
>my UrS4 gets 15W-50, and my biturbo S4 gets 5W-40.  both
>synthetic.
>
>-teddy
>
>--- Bruce <bruce.cranford at comcast.net> wrote:
>
>  
>
>>Jim;
>>I have a 2000 S4, used Mobil 1, 15-50 since it was new, with OEM oil 
>>filter.  I have had no problems that I can trace to the oil.  Good luck 
>>in tracking down the problem.
>>Bruce Cranford
>>
>>AUDIJIM at aol.com wrote:
>>
>>    
>>
>>>S-heads,
>>>
>>>Here's a new one for you. I changed the oil in my S4. I used an OE Audi 
>>>filter and Mobil 1 15-50. Now the car runs worse than it did before I
>>>      
>>>
>>changed the 
>>    
>>
>>>oil. It used to run on 4 cylinders as soon as you start it. Actually, it
>>>      
>>>
>>starts 
>>    
>>
>>>on 5 and then drops #4 until it warms up a bit and them hits on all 5. Now
>>>      
>>>
>>it 
>>    
>>
>>>runs on 4 for a lot longer duration than it used to. I'm seriously thinking 
>>>of swapping another AAN I have on a stand into the car over Christmas break 
>>>      
>>>
>>>from work. I have off from the 24th through 03 JAN. I'll swap over all the
>>RS2 
>>    
>>
>>>stuff and see what happens. I'm at a total loss here for this problem. I'm 
>>>either tracking down a cylinder/piston problem or a cylinder head problem at
>>>      
>>>
>>this 
>>    
>>
>>>point. What throws me for a loop is the starting on 5 cylinders and always 
>>>dropping #4. Even when I run the car on 4 cylinders, it starts to even out
>>>      
>>>
>>over 
>>    
>>
>>>3000 RPM. But I think it's only feeling like it is, as soon as I shift up,
>>>      
>>>
>>the 
>>    
>>
>>>RPM drops and I feel the missing cylinder. Back to the beginning, how could
>>>      
>>>
>>an 
>>    
>>
>>>oil change effect the running condition so much? I do not know what
>>>      
>>>
>>viscosity 
>>    
>>
>>>the previous owner used, and this was my first oil change since I purchased 
>>>the car.
>>>
>>>Jim
>>>
>>>
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>>>
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