I was looking at the Lubrizol chart for relative differences between 502 and 504 VW standards. Although I'm a complete no-nothing and know-nothing on engineering-type stuff, it seems to me that the 504 standard provides far more benefits than 502/505 approvals. The big "delete" is phosphorus, which looks to me more like a side effect of zinc anti wear additives rather than having any benefit of its own.
However, anti-wear, anti-aging, anti-sludge etc properties are all at much higher relative levels in 504 oils.
So, more than just making a brand choice, should I be considering 504 oils rather than 502? (504 is backward compatible with 502 with long-drain interval spec, low sulfur.
In the chart, 502 is the gray, 504/507 is the blue)
However, anti-wear, anti-aging, anti-sludge etc properties are all at much higher relative levels in 504 oils.
So, more than just making a brand choice, should I be considering 504 oils rather than 502? (504 is backward compatible with 502 with long-drain interval spec, low sulfur.
In the chart, 502 is the gray, 504/507 is the blue)
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