'07 A3 2.0t Oil Consumption

[Grant Lenahan]

all correct - with the huge caveat that thick oil at cold temps may starve a motor - so run it light and slow until temp is at least registering.

That's the best fo both worlds.

Grant
On Mar 25, 2010, at 12:17 PM, Cody Forbes wrote:

> But higher viscosity oil provides more protection to the bearings in  
> the bottom end as well as piston skirts. It doesn't get forced out  
> from between the bearing and journal as easily when put under high  
> stress. In reality you need a compromise of both for cold startup and  
> protection when warm. During the summer you should be running thicker  
> oil for sure.
> 
> We run 20w50 in all of our Porsche race cars. I run 15w50 Syntec in my  
> 'fast' 5000tq except in the coldest months. Purely for anecdote  
> because of the very specialised nature, Top Fuel and Funny Cars run  
> straight 80 weight oil because that's what it takes to keep the rod  
> bearings from contacting the crankshaft journals when EACH rod bearing  
> is trying to support 700+hp.
> 
> My point is that lower viscosity is not better lubrication. All it  
> means is that oil can get into smaller nooks and crannies and lower  
> the oil pressure a bit on cold starts. Thicker oil provides more  
> protection, but doesn't get in some of the tight tolerance areas that  
> newer engines have as well as bringing the oil pressure dangerously  
> high on cold mornings (ask all the PCA racers that have exploded an  
> oil cooler at the last/first event of the year). Rub your hands  
> together with some peanut oil then with some Karo and figure out which  
> one lubricates better.
> 
> YMMV, Im not an oil manufacturer, nor am I am chemist, I'm not telling  
> you what to do, etc etc, disclaimer, lawyer, blah blah blah. The above  
> is just voicing some information I have gathered over a lifetime of  
> experiance dealing with high performance engines.
> 
> -Cody (mobile)
> 
> On Mar 25, 2010, at 11:04 AM, Jeffrey Brown  
> <jeffrey.r.brown at gmail.com> wrote:
> 
>> Interesting comments on the oil weight.  Where I come from, or at
>> least my knowledge of certain cars, is that you always put in the
>> lowest viscosity oil you can get your hands on, and this is typically
>> Mobil 1 0w-30.
>> 
>> What you describe almost sounds to me like you are making up for bad
>> seals or bad tolerances by increasing the oil viscosity at the risk
>> of increasing cold weather and start-up engine wear, and especially in
>> a turbo car.
>> 
>> My knowledge is specifically about Volvos and older ones (80's-90's
>> 200s, 700s, 900s, etc) both gas and diesel.  There is a guy I know of
>> who
>> specializes in the volvo D24 and D24t engines (which is VW sourced 6
>> cylinder) that uses mobil 1 0w-30 in these engines (not the "diesel"
>> grade oil)
>> and changes at 25,000 mile intervals (not counting filter changed I
>> think every 10k).  He's got empirical data to back up this behavior,
>> but I admit this is
>> an extreme example.
>> 
>> I guess what I am curious about is whether the conventional wisdom in
>> audi land is not consistent with this wisdom, and that it is common
>> for people
>> to use heavier weight oils in general, or for specific applications,  
>> etc?
>> 
>> In my case, I was kind of surprised when I found out 0w-30 is not a
>> "supported" oil for my A3
>> 
>> --jeff
>> 
>>> Actually, that's not entirely true...both the urq and the S6 lost a  
>>> quart of oil
>>> fast after the idiots at the dealer put 0W40 new spec oil into  
>>> them, even though I
>>> had provided the 5W50 and filters.  Used the filters, but not the  
>>> oil.  Brainless
>>> incompetents.  First oil change with the right oil, they both lost  
>>> a little, but
>>> since then, nothing  after 3000-4500 miles each oil change.
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Grant Lenahan
glenahan at vfemail.net