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Anyone know what type of oil to put in a 58 Thunder bird? Auto shop told me to put 10/15 diesel oil in it?
Your man is looking for the most ZDDP he can get absent oil additives. Your engine was built to run high Zinc and Phosphorus content oil. Unfortunately, that eats up catalytic converters, so oil companies took it out and engine manufacturers stopped making flat tappet engines. To make things worse, you engine was engineered to run on LEADED gas, which is also not available.
- Dave
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