Thread: What oil is right for a 429?

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If the "clearancing" was really done to this engine, it means that the bore was loosened more to the piston than they should be compared to street trim. The bearings have been set looser by either grinding the crank on the "outside" or the bearings were hand rubbed to make a looser fit. Rings were gapped a bit more than required. These are old school and have no place in today's building world. Run the oil you feel comfortable with. I personally like the 20/50 atittude. I have started old engines in sub zero weather with no problems. I have included a chart that is current as of 5/10/07 that contains properties of branded oils. First line is the name; second, viscosity; third, Phosphorus; fourth, Zinc; fifth, Boron; sixth, detergents; seventh, API rating. Look for the best of the third, fourth, and fifth column lines for best combo.