-- I was taught that the greater the spread in VI numbers, the more additives and likely the lesser quality, given a choice. I was told that the lower number is at best the starting grade, the rest i
This came through the Chevy truck list last week: http://www.unofficialbmw.com/all/misc/all_oilfaq.html Pretty good explanation of oil properties - makes a good case for synthetics. Dave Camp be
That is true for conventional oils, but not nearly as much so for synthetics. Castrol, in fact, is the only synthetic that does not use any viscosity enhancers at all, the viscosity range is a "natu