Oil pressure rises slowly

[DalecarliaEric]

I think the oil pressure rises slowly. When the car has been sitting for a few days and I will start it, it will take about 6-7 seconds before I have full oil pressure (5.5 bar) in my 390 cui engine and some noise will cease. At idle, with hot Engine, the pressure is about 2 bar. Isn't seven seconds a little long time for the oil pressure to reach right pressure?

I use 20W-50W oil. Perhaps it have something to do whit the Hydraulic Valve Lifters. Maybe Wynn's Hydraulic Valve Lifter Concentrate can speed up oil pressure, or do you have any other suggestion? Thanks in advance.

Eric

[OUR5T8BIRD]

I think the oil pressure rises slowly. When the car has been sitting for a few days and I will start it, it will take about 6-7 seconds before I have full oil pressure (5.5 bar) in my 390 cui engine and some noise will cease. At idle, with hot Engine, the pressure is about 2 bar. Isn't seven seconds a little long time for the oil pressure to reach right pressure?

I use 20W-50W oil. Perhaps it have something to do whit the Hydraulic Valve Lifters. Maybe Wynn's Hydraulic Valve Lifter Concentrate can speed up oil pressure, or do you have any other suggestion? Thanks in advance.

Eric

That seems like a heavy oil for a 390 , more like motor cycle oil . Why not go down to 10W30 or 15W40 at most .

On our 390 ( '66 Bird) we use 10W30 and pressure is immediate and then slightly drops as it worms up .

[jopizz]

I agree. Try a lighter viscosity oil. I normally use Rotella T 15W-40. You want to use an oil with as much zinc in it as possible.

John

[scumdog]

I have always used GTX 20-50 in our ‘66 Thunderbirds, never had issues regarding its ‘thickness’.
I don’t see an issue with the apparent slow increase in oil pressure, unless it was accompanied by mechanical banging and clattering I would not be concerned, - who knows, the gauge could be the issue?

[bird 60]

I've been using Penrite 20w 50 on my T.Birds since 1999, & haven't had any problems. I also use the same in my 1989 Mercedes 260e.

Chris.....From OZ.

[Dan Leavens]

That seems like a heavy oil for a 390 , more like motor cycle oil .

I agree I have used 10W30 for years