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  1. R

    Layer at bottom of oil bottle?

    I did a change a few days ago and used all my odd bottles of oil laying around. They had been hanging around for a while. One bottle was dated 2006, two from 2008 and 2 litres left from the last change - although this bottle was dated 2009. The question is at the bottom of the 2006 & 2008...
  2. R

    Moly added to oil

    This is my first post, I hope this hasn’t been gone over before! I am wondering on the effect of Molybdenum Disulfide or Titanium Disulfide on the brass present in motors. I have been reading a bit on GL 4 and GL 5 gear oils and the difference in sulphur levels affecting gear boxes with brass...
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