The advise from Blackstone Labs to go to 5,000 mile oil change might not necessarily decrease your wear rate of metals. Also their so called averages for this kind of CR TDIs seems to be fairly high. I do not own a CR TDI so folks that own one might chime in.My latest report after 19,500 K miles is showing 10ppm/1k Miles of AL and FE. Also 1ppm/1K miles for Cr and CU. This is a CRKA and It is due for its first timing belt change? Also has a minor coolant leak.
This has been my experience using liqui moly TT 4200 507 oil. TBN was depleted and < 1.0 at 10k mikes with high wear metals. Mechanic recommended I change oil every 7500 and analysis showed TBN was 2.0 at the shorter interval.20k mile oil change seems to be asking for trouble if you aren't monitoring TBN. I've seen TBN done at 10k miles on almost every 507 oil...so then you're going another almost 10k miles on acidic oil...just eating away at your metals.
I would go to www.imgur.com upload the image there and once finished you are going to get different options for types up links you want. Select the appropriate one for message boards and forums, copy it and then past it here.Okay, I see that I "may not" post attachments. So can I get permission from someone to post a photo of my UOA?
I just got into the game and learning. I haven't been able to transfer the files to post yet, but will as soon as possible.Yep your correct, CRs do have high FE and Al levels , mine are high but pretty predictable,Al always seems to be half the PPM of FE. Mine are touching 110 FE per 15k(10k miles) and 55 Al. Only thing I'm worried about is the potassium levels in mine which are the same level as Al but again they seem to be predictable.
This one, thankfully, isn't my car. It's one that came into the shop here with a ripped up timing belt. It still has the balance shaft module at 200k miles!Sodium is indicative of coolant as well as potassium. 95 ppm sodium, elevated viscosity and water could indicate coolant migration into the engine oil.
Overall it looks pretty bad, however it’s just one data point. You could tear down the engine and do a rebuild, or just keep driving it and re-sample at a shorter interval 3-5k and see what it says. Could be a sample mix-up at the lab too. Can’t tell exactly with just one sample data point. Monitor the coolant level and see if it drops over the next few months.