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My understand is that dealers were using dino oil and changing per the FSS. This was causing problems which lead to the lawsuit and settlement etc.
However I doubt that say 5w30 Pennzoil changed every 3k miles would do harm. Or did your dad follow the FSS?
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2006 CL500
1969 280SE
2023 Ram 1500
2026 Genesis GV70
2007 Tiara 3200
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