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3rd oil change under my ownership after wait 4 MONTHS for my oil to come in from Driven. Last one was Sep 2022. I changed the injectors less than 500 miles later in Jan 2023 due to concerns with fuel dilution. Injectors were original to the car with 2006 dates on them. Fuel dilution is halved. I wonder if my pre-oil change warm up contributed some. I road around for about 20 minutes and got it up to temp, but definitely not a long and hot run. New plugs and coil packs went in about 2 weeks before the oil change. Engine air filter was replaced in Oct 2021, I hope that the reason for my increase I silicon. Thoughts?
3rd oil change under my ownership after wait 4 MONTHS for my oil to come in from Driven. Last one was Sep 2022. I changed the injectors less than 500 miles later in Jan 2023 due to concerns with fuel dilution. Injectors were original to the car with 2006 dates on them. Fuel dilution is halved. I wonder if my pre-oil change warm up contributed some. I road around for about 20 minutes and got it up to temp, but definitely not a long and hot run. New plugs and coil packs went in about 2 weeks before the oil change. Engine air filter was replaced in Oct 2021, I hope that the reason for my increase I silicon. Thoughts?
The increased silicon is likely the cause of the increased bearing wear. Renew the air filter and let's see if the silicon, iron, and copper numbers drop back down in the next one.
Second UOA since I switched to FR50. Still changing at a relatively short interval. As a reminder, at least one of my cylinders showed evidence of streaking, so trying to take good care of it to prevent/delay onset of anything worse. I don't see any numbers that are hugely different to the point of concern. Continuing to run FR50, keeping the revs around 3k and under until oil gets up to temp, running with the LTT, monitoring for any changes in rate of oil consumption, trying to start any drive right away and avoid very short trips, trying to stick to only filling up with TOP TIER gas. This is a 2006 C4S Cabrio 6MT with just over 125k miles, it's my first P car and I've owned for a little over 2 years. I've also considered having the fuel injectors replaced (no idea of their age) but considering the fuel dilution doesn't seem to be upsettingly high I don't see the point. Let me know if you see anything off with the analysis or my habits
Your results look good overall but your previous sample is the one that Indyxc and I were discussing (middle sample from post #665). The only thing I really don't understand about your UOAs is that your DI40 seems to shear down a lot more for some reason that is not immediately clear to me. 11-12 cSt that your sample show is much lower than I have ever seen DI40 shear down in a 5K OCI. It always stays above 14.0 cSt for me even when I do 5K OCIs.
3rd oil change under my ownership after wait 4 MONTHS for my oil to come in from Driven. Last one was Sep 2022. I changed the injectors less than 500 miles later in Jan 2023 due to concerns with fuel dilution. Injectors were original to the car with 2006 dates on them. Fuel dilution is halved. I wonder if my pre-oil change warm up contributed some. I road around for about 20 minutes and got it up to temp, but definitely not a long and hot run. New plugs and coil packs went in about 2 weeks before the oil change. Engine air filter was replaced in Oct 2021, I hope that the reason for my increase I silicon. Thoughts?
Looks good overall. The virgin sample I have shows 6 ppm of Si in DT40. There can be some variation in actual formulations so I would just monitor it. Fuel dilution looks better. It's also not that big of a deal but your copper is slightly elevated. Nothing to give worry to but I would also look at that going forward periodically as well. Overall looks pretty nice....
Second UOA since I switched to FR50. Still changing at a relatively short interval. As a reminder, at least one of my cylinders showed evidence of streaking, so trying to take good care of it to prevent/delay onset of anything worse. I don't see any numbers that are hugely different to the point of concern. Continuing to run FR50, keeping the revs around 3k and under until oil gets up to temp, running with the LTT, monitoring for any changes in rate of oil consumption, trying to start any drive right away and avoid very short trips, trying to stick to only filling up with TOP TIER gas. This is a 2006 C4S Cabrio 6MT with just over 125k miles, it's my first P car and I've owned for a little over 2 years. I've also considered having the fuel injectors replaced (no idea of their age) but considering the fuel dilution doesn't seem to be upsettingly high I don't see the point. Let me know if you see anything off with the analysis or my habits
Looks good. The 10/26/22 report's 1.5% fuel dilution on your port injected engine would have worried me at that point in time but it has come down a lot to .85 which is more acceptable so doesn't seem to be a lingering concern and maybe something just to keep an eye on going forward. Short OCIs with FR50 makes sense. Also since you mentioned bore streaking, I just wanted to point out that this is strictly cosmetic and not indicative of a problem. That being said it takes a trained eye with some experience (and a good quality borescope preferably with an articulating head) to be able to tell the difference between streaking and scoring. Report looks good overall, strong work.
I purchased a 2008 C4S w/ 50k miles back in December and did my first oil change last week (w/ analysis), and I just got the results from Lake this evening. I of courses did a PPI w/ borescope before purchase, but did not do an analysis until now. I was a bit nervous as I took the sample as this was years of work to get to this point, but at my first review of the results - I am quite pleased!
I purchased a 2008 C4S w/ 50k miles back in December and did my first oil change last week (w/ analysis), and I just got the results from Lake this evening. I of courses did a PPI w/ borescope before purchase, but did not do an analysis until now. I was a bit nervous as I took the sample as this was years of work to get to this point, but at my first review of the results - I am quite pleased!
Great Thread!
Despite it maintaining good viscosity, those Iron & Copper numbers (bearing wear) are too high for 4k miles. Any double digit metal wear at.5k miles is too much and you have 12 ppm of Iron at 4k miles.
What oil did you put back in at the change as you need something better.
Despite it maintaining good viscosity, those Iron & Copper numbers (bearing wear) are too high for 4k miles. Any double digit metal wear at.5k miles is too much and you have 12 ppm of Iron at 4k miles.
What oil did you put back in at the change as you need something better.
I don’t know what was in the car - but I put in DT40 5w40. Open to hearing other oil thoughts too.
12.3 cSt is not a good viscosity for DT40. If it was my car I would want to know the fuel dilution % (without question one of the most important things on the report) and it looks like another mistake on a Speediagnostix report.
12.3 cSt is not a good viscosity for DT40. If it was my car I would want to know the fuel dilution % (without question one of the most important things on the report) and it looks like another mistake on a Speediagnostix report.
Car didn't have DT40 in it - it does now. OP said he didn't know what oil was in it, but I can tell from the low Moly number and low Phosphorous, it wasn't DT40. My guess is some type of Liquid Moly, but Moly might even be too high for any of the LM oils unless an MoS2 or Ceratec was added to it.
Car didn't have DT40 in it - it does now. OP said he didn't know what oil was in it, but I can tell from the low Moly number and low Phosphorous, it wasn't DT40. My guess is some type of Liquid Moly, but Moly might even be too high for any of the LM oils unless an MoS2 or Ceratec was added to it.
I see so the oil analysis is for whatever was before the DT40, thank you. But either way the 0 for fuel dilution is an error in the report and should be addressed.
01-26-2024, 11:29 PM
