Oil Analysis
04-25-2003, 08:04 AM
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Oil Analysis
<center><img src="http://pictureposter.audiworld.com/16699/oil_4_03.jpg"></center><p>I have about 20K on my TT ('01 180C). I have followed the Audi recomendations on oil change frequency (5K, 10K, 20K) except that I have used Mobil 1 (5W-30) for every change. I let Audi use their filter.
I was a little concerned about not changing for 10K miles so I had the oil analyzed by Blackstone. I did not have to add any oil during between 10 and 20K miles; car only used about 1/2 guart. I took a sample of the oil the day before I took the car in for its 20K service / oil change. The results of the analysis are shown above.
One problem was uncovered - the "insolubles" were high (2.0%) compared with desired values (0.6%). They say that the involubles were due to oil oxidation due to heat / use; they suspect that the filter may have been bypassing.
Does anyone have any thoughts on this result. I thought that synthetic oil was susposed to oxidize much less than regular oil. Did the filter bypass because too much insoubles were generated? I was wondering if another filter make might be better - have more capacity. I also have heard of people using oversized filters with synthetic oil to extend oil changes.
I was a little concerned about not changing for 10K miles so I had the oil analyzed by Blackstone. I did not have to add any oil during between 10 and 20K miles; car only used about 1/2 guart. I took a sample of the oil the day before I took the car in for its 20K service / oil change. The results of the analysis are shown above.
One problem was uncovered - the "insolubles" were high (2.0%) compared with desired values (0.6%). They say that the involubles were due to oil oxidation due to heat / use; they suspect that the filter may have been bypassing.
Does anyone have any thoughts on this result. I thought that synthetic oil was susposed to oxidize much less than regular oil. Did the filter bypass because too much insoubles were generated? I was wondering if another filter make might be better - have more capacity. I also have heard of people using oversized filters with synthetic oil to extend oil changes.
04-25-2003, 08:38 AM
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Re: Oil Analysis
Im not an Oil expert, but I refuse to change my oil every 5000 miles. I change it every 2500/3000 miles. I dont care if GOD said to change it every 5000miles. It just doesnt make sense, not matter what oil your using.
my 2centz.
my 2centz.
04-25-2003, 08:56 AM
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Very interesting! How long between your 10k and 20k changes?
Do you plan on doing this for future oil changes? I would be interested in seeing the difference between waiting 10k and 5k miles.
Myself, I change my oil and filter every 6 months, I don't drive enough to go that many miles.
Myself, I change my oil and filter every 6 months, I don't drive enough to go that many miles.
04-25-2003, 09:30 AM
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Re: Oil Analysis
Can you say "Turbo"? Due to oil passing through the hot turbo your oil will see much higher temps than in regular engine. I personally refuse to use anything thinner than 10W in summer time and prefer going with Mobil 15W-50W due to its high viscosity and stability under high temps. (Please note, M1 15-50 pour point is around -45F - plenty if you ask me, meaning it's not too thick) Also, do you have turbo timer on your car? Turbo's are finicky period. If 15-50 is too thick for your taste, go with Amsoil 10-30 Turbo formulated oil. I did a TON of research on the topic of oils back in the day. 5k is normal for synth.oils. Recommendation is to also change your filter when you change your oil, they are cheap compared to the oil itself.
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04-25-2003, 12:36 PM
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Re: Oil Analysis
I have had the same thoughts about oil and filters. I change my oil every 2k to 2.5k fot the simple fact that this is a high performance turbo engine. The filter has a lot to do with how well your oil responds with your turbo. The Audi filter is pretty well a common regular paper filter. I have copied in a link so that you may check out this oil filter review. I use Mobil 1 5w/30 super synthetic as well as the Mobil 1 filter because it came in very high in the field and uses a non paper element. I hope this helps.<ul><li><a href="http://www.frankhunt.com/FRANK/corvette/articles/oilfilterstudy/oilfilterstudy-german.html">http://www.frankhunt.com/FRANK/corvette/articles/oilfilterstudy/oilfilterstudy-german.html</a</li></ul>
04-25-2003, 12:39 PM
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Re: Oil Analysis
<center><img src="http://www.frankhunt.com/FRANK/corvette/articles/oilfilterstudy/oilfilterstudy.html"></center><p>Also see this thread.<ul><li><a href="http://www.frankhunt.com/FRANK/corvette/articles/oilfilterstudy/oilfilterstudy.html#mobil1">http://www.frankhunt.com/FRANK/corvette/articles/oilfilterstudy/oilfilterstudy.html#mobil1</a</li></ul>
04-25-2003, 01:29 PM
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Your oil filter will give out
before your oil will. I might recommend changing the oil at the same interval but change your filter every 3k. I am still old school I guess. I still stick to the every 3k for changes, oil and filter with Mobile one. I do autox and track, so I think it is warrented, even though I do the same for all of my vehicles and don't track any of them.....