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Just updating this. Well it turns out there was nothing to worry about. I had them retest the TBN which came back still at 0.0 after I sent them a virgin sample and they claimed the VOA TBN was 9.4 from memory. I know that was untrue as according to Mobil its around 6.5. I then sent a UOA...

Yep my head is spinning I was thinking about this and it could be endless with what it could be. The problem could be caused by a multitude of different or linked things and everything inbetween when it comes to fuel, from it been just a change in the octane from 98 to 95 and the ecm...

Funny.. (not really) you should mention fuel, I have been having LSPI events in my 2016 Forester XT which has slowly been getting worse over the last six mouth to the point it was happening ever time I drove it. It turns out it was 98 Octane (93 AKI) that was the cause, changed to 95 (91 AKI)...

Is this the black bottle euro formular Castrol edge? Looks simular to the gold bottle we get over here.

Thanks for all the comments. I too thought that the low run would of been low enough to judge how this oil would be with its low tbn and the sulphur content etc, but it seems that I should of changed it sooner as per the UOA, unless they have stuffed up? A person from the lab rang me while...

Hi I’m looking for some help / advice with a recent UOA I had done on my car. 98 RON fuel sulphur content over here in Oz is supposed to be 50 ppm. The TBN came back at 0 on a sample with 4040 kms (2510 miles) on the oil, which was ran for approx two months. I’m wondering if I should get it...