Oil Recommendation

Canadian_Bacon

Armchair Athlete
Established Member
Joined
Apr 14, 2010
Messages
373
Location
Milton, Ontario, Canada
Friend of mine is wondering what Amsoil oil to use.

1969 Firebird

Mostly a 1/4 mile car but sees the street every so often maybe 1,000 miles a year

11.25:1 compression

390hp at the wheels

400CI big block ram air 4 (carbureted)

4spd trans


I wasn't sure what to suggest, was thinking RD30 or RD50 but not sure which would be better.
 

UnleashedBeast

Engine Lubrication Guru
Established Member
Joined
Oct 20, 2010
Messages
8,771
Location
Pensacola, Florida
I'd really like to know if this person has an oil pressure guage in his car. If yes, what oil viscosity does he run now, and what is HOT idle pressure?
 

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