Yeah, I agree - I'm thinking its best to keep the OCI around 9,000km. I'm going to try some Castrol Edge soon to see if I get any better results. I would like to try Magntec but cant find it anywhere near me.
You could try it, I would be surprised if Edge tested better. Not from my use of it anyway. I am shocked the M1 sheared as much as it did. The QSUD, although not the most popular oil, is gaining momentum. It certainly is shocking me the last 2 years. I never use to care for QS products but that's all changed now. I'd run the QSUD 5w30 with UOA. IMO
Yeah, I'm not expecting anything dramatically different from castrol but I figure it's worth a try. The first 60k was with PP, then about 40k with M1. Have enough castrol for 3 oil changes (about 27k) so should be a good comparison. Maybe I'll give QSUD a try after that
Need a thicker oil. This oil is getting beat up and shearing evident by the tin value!
Back in the day when I had a Lexus ES330, that car would beat up the oil and the Tin value would always be elevated. I seeked out Terry Dyson and his professional advice and that is what he would tell me. If tin value was over 2 per 10,000 miles 99.9% of the time the oil had sheared out of grade by quite a bit.
Has it had the same oil all it's life? I wonder if Mobil 1 0W40 would reduce the Iron Copper and Tin?
Mobil 1 0W40 is close to being a thick 30, I'd use that, then it'd shear and or dilute down to a mid range 30.