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2002 9³HOT (T7), automatic, 180,000 miles
Car was bought from a Dodge dealer in December 2008 with 60,000 miles on it. PCV upgrade had already been done. Based on multiple owners' UOA results at the time, I've always done 5,000 mile OCIs with Mobil 1 5W-40, 10W-40 High Mileage, or 15W-50 oils. All of these are dual rated with ACEA A3/B3. Because I decided to follow this short OCI schedule, I never did a history of UOA results like I did with my 1999 9³SE (T5).
Then, around the beginning of September 2018 my coolant overflow tank's hose nipple broke off. I'd been getting occasional "low coolant" messages but wasn't low on coolant, so when it popped up again on the SID I ignored it for several days. When I finally checked it I was surprised to see that the overflow tank was empty and the hose was hanging down from the tank. At that point I was about 2,500 miles into my OCI and decided to finish it without changing the oil or even the filter. When I reached 5,000 miles I took a sample and sent it off to the lab. I was a little nervous because the sample was VERY black!
I just got the results back and they look reassuringly normal. The additives were a little lower than I'm used to seeing (soot, sulfur, and oxidation were all normal), but viscosity was still good for the 15W-50 and 5W-40 mix I was running. The lab's notes are, "Label indicates coolant overflow failure. The compartment wear is normal. No problems indicated at this time."
It reaffirmed the reasons why I choose to run a Group IV synthetic in these engines. :-)
posted by 73.229.230...
1
, Thu, 21 Feb 2019 18:00:431, Mon, 25 Feb 2019 08:52:47
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