I’ve posted a VOA and UOA (see separate threads) for a sample of Castrol TWS 10w-60, API SJ oil as used in a ’05 BMW M3. These are my first readings on this type oil,
and, considering the application, was surprised to find such relatively low levels of phosphorous/zinc anti-wear additive (641/796 in the VOA), although there is a good amount of boron which I believe is also an anti-wear additive.
I have one question: The oil is rated API SJ. What is the advantage or possible reason for formulating this oil to such an old API rating?
and, considering the application, was surprised to find such relatively low levels of phosphorous/zinc anti-wear additive (641/796 in the VOA), although there is a good amount of boron which I believe is also an anti-wear additive.
I have one question: The oil is rated API SJ. What is the advantage or possible reason for formulating this oil to such an old API rating?