Below are the AMSOIL oil and filter recommendations for your 1990 Pontiac Firebird 3.1L V6:
1990 Pontiac Firebird 3.4L 6-cyl Engine
Your 3.1L V6 engine turns out 140 hp @ 4,400 rpm and 185 lb-ft @ 3,200 rpm. It can go from 0-60 in 8.76 seconds. This vehicle is a good candidate for AMSOIL synthetic motor oil and is worthy of taking excellent care of long term.
Here is what you need:
You need 4.5 quarts of AMSOIL 10W-30 Signature Series 100% Synthetic Motor Oil ATM-QT which you can learn more about here:
You need the AMSOIL nano fiber long life oil filter for your car and the model is EAO23.
To learn how to get wholesale dealer pricing and the fastest and easiest location to get Amsoil for your Firebird go to where can I buy amsoil oil.
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