I have been running regular in mine for who knows how long. But I have tried premium, and noticed no difference. Besides, the easier it ignites, the happier my 3.9 is going to be.
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1991 RRC
2 1989 RRC's
1998 RR P38A
1967 SIIA 88
1969 SIIA 88
1967 SII 109
1971 Vampire Radio Body 101FC
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