I'm running delo 15w-40 with fram ultra in my 4.3gxi engine. With the engine at idle and at running temp, I'm seeing my gauge at the quarter mark (20psi?) And while under load at higher rpms I'm seeing 40 psi. Is this normal? The engune has 200 hours on it so it's like new. Runs like a top. Doesn't burn oil. I'm just asking because I can't remember if the pressure gauge has fluctuated that much.
Thanks
Thanks