Quote:
Originally Posted by edycol
So reasons for less calcium is IMO LSPI prevention. High calcium content in the oil can create perfect environment for LSPI event. That is now biggest worry with small turbo engines and 8-10 gears automatics where engine is usually in highest gear, low rpms, and then there is sudden demand for power. In large engines (pretty much 2.0ltr and up, although there are some 2.0ltr engines that experience this) is non issue. But there are a lot of small turbo engines.
I think that is what is driving Castrol to use less calcium. They also gave up on titanium. I think it was an issue titanium not mixing well with magnesium.
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Cheers, So for us its not really a issue/concern. So something with a higher Calcium and a lower Magnesium rating would be better.
What about the mix of Zinc and Phosphorus? I think i saw somewhere, (maybe here) say that Zin should in around 800-1000ppm, range. Looked over at the air-cooled (no idea on difference), Porsche guys, and they all say 1200ppm as the minimum?