Quote:
Originally Posted by XfireZ51
Paul,
I'm one of the guys that changes the oil in his "toy" cars every 2,000mi along w filter. Did that with the 84 also. So High Mileage or Synthetic means nothing to me. The Castrol Diesel has the ZDDP levels needed at the price of regular oil ($4.50/qt) and I've used the GTX stuff for over 30 years.
The issue of ZDDP never came up w my 84 and as you know that was a flat tappet motor. I converted over to a full roller setup in 2000 for performance not the ZDDP issue. I have posted pics of the new cams in my LT-5 motor after about 2500mi of use. Lobes look like new.
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Dom, have you compared the ZDDP data from a few yrs ago vs today's levels in the Castrol you're buying? I'm told that the levels were dropped when catalytic converters were required on the big rigs.