Castro’s GTX is the oil we use, and the gas additive I use is STP octane booster. The 400 motor seems to like it, never had any unusual color change to my plugs.
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"BIG DADDY" VIDEO http://www.youtube.com/watch?v=QnFIVLuwO9A
~MaryAnn~  AKA "Stickybuns"
1969 Firebird 400 Convertible
1978 Bandit T/A Tribute
1977 RED TA
I'm the FiredUp PY bad girl 
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