M
mr4speed
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- Last seen
- Joined
- Aug 15, 2019
- Thunderbird Year
- 1966
What wt. engine oil do you fellas use on a 1966 428 engine? I am currently using 10W30 with ZDDP in it plus I add a small bottle more. No leaks or burning oil. Do you think I could switch to synthetic of 20W30 or 40 and still use some ZDDP without harm to the engine. I use synthetic in my newer cars and I love it.