I have recently acquired a 1974 Pontiac Firebird Formula 400. I replaced the cracked heads and am now putting everything back together. What viscosity oil should i use in the motor?What viscosity oil should i use?
10w-30 will work fine in that engine.What viscosity oil should i use?
How cold is it there? If mornings are around 45*F and up, then use 10W-30 or 10W-40. If it is below 45*F, then use either 5W-30 or 5W-40.
If it is on a totally fresh engine rebuild, use the 30 weight. If it is slightly worn on your muscle block above 50K miles, use the 40. Our older muscle can easily use the 40 due to tolerances.
Use the exact oil the manual recomends Viscocity wise, Engines are engineered with specific clearances and need proper lubrication
It depends mainly on the climate in your area
So check with the engine oil specifications for your climate
10w30
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