Rear Diff, any DIY tips? - Page 2 - Chrysler 300C Forum: 300C & SRT8 Forums
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Old 09-22-2015, 07:33 AM   #11 (permalink)
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Lab results

I received the gear oil analysis back from Blackstone Labs. From the breakdown of whats in the oil one can only conclude the gear oil in the differential of these cars is best replaced early. Either that or the previous owner (who put 27K miles on the car) really abused the hell out of it. If you can't open the attached here's the statement from the lab:
PAUL: Yes, we think it was a good idea to change this oil. There's a lot of metal here and when this much
metal accumulates it can make the oil itself abrasive. Beyond that, there's enough metal here that we're
wondering if something is wrong in this differential. Granted, there's some wear-in metal here since this is
factory oil, but that's a lot of iron. Chrome, tin, and nickel are likely alloy metals or maybe coatings. We're
not sure where aluminum is from. If this oil was abrasive, maybe it's from the case. Silicon is likely harmless
sealers rather than dirt. Check back in 10,000 miles.
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Old 09-22-2015, 08:41 AM   #12 (permalink)
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I just replaced the OEM oil and gear lube in our 2015 300C Pt at 3300 miles. Break-in period over. Starting the conversion to Quantum Blue fluids as I have in our previous vehicles.
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Old 11-20-2015, 02:31 PM   #13 (permalink)
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Quote:
Originally Posted by Paul S. Safford View Post
I received the gear oil analysis back from Blackstone Labs. From the breakdown of whats in the oil one can only conclude the gear oil in the differential of these cars is best replaced early. Either that or the previous owner (who put 27K miles on the car) really abused the hell out of it. If you can't open the attached here's the statement from the lab:
PAUL: Yes, we think it was a good idea to change this oil. There's a lot of metal here and when this much
metal accumulates it can make the oil itself abrasive. Beyond that, there's enough metal here that we're
wondering if something is wrong in this differential. Granted, there's some wear-in metal here since this is
factory oil, but that's a lot of iron. Chrome, tin, and nickel are likely alloy metals or maybe coatings. We're
not sure where aluminum is from. If this oil was abrasive, maybe it's from the case. Silicon is likely harmless
sealers rather than dirt. Check back in 10,000 miles.
Hi there just wanted to chime in, my local race shop told me the (factory fill) in our NAG-1 5-SPEEDS and the GEtrag diff is garbage mineral based oil. He recommended Motul atf+4 and Motul Gear300LS for the diff (especially if I was considering even one track day), 100$ for the diff fluid but man what a difference. Everything just feels better, even shifting from D-R OR P-R it simply feels smoother.
Yes these diffs are very tempermental to overfilling.
Thats funny too Paul, i get that TCS light flash everytime i pull out my driveway onto the main road, my driveway is 200meters. I figured its just a system check thing.
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