I usually go 3 seasons of weekly racing from April to November and use 10-30 Brad Penn Racing Oil. Lots of 3 day race weekends plus lots of test n tunes. PA and Ohio weather ( Colder than heck to hotter than )

1970 Duster
Edelbrock headed 408
5.984@112.52
422 Indy headed small block
5.982@112.56 mph
9.42@138.27

Livin and lovin life one day at a time