To update, I checked my gauge today and when it hits 1500 RPMS, it is already at the "3" bar, which is where Hattaras said it should be. When idling however when in drive (idling at 500 RPM)and fully warm, it drops to slightly above the "0" which concerns me- should I be concerned since it is at "3" @ 1500 rpms? I also checked it and when it is idling at full temperature when in park (around 750 RPMS), it is right at the "1".

I know the oil is old and needs changing. I hope that brings it up further than it is when it is fully warm and idling in drive.

Thanks in advance.