A new issue appeared with the oil pressure on my beta 43 with a shade under 5000 hours.
When cold, i have good oil pressure at idle and cruising rpms, circa 50psi, however, when warm at below about 1200rpm, down to idle i have (apparently) zero oil pressure.
I have changed the oil and filter about 50 hours early, with 15/40 mineral, and a beta filter incase the old filter was blocked, or the oil had thinned out due to diesel in the oil or something, but it made no difference, as soon as the new oil had warmed up, pressure vanished at low rpm.
I assume the pump is ok, as i would expect it to worse with cold thick oil, engine temp is normal, oil level was normal before i changed the oil, and is still normal, could the gauge be lying to me?
has anyone had this issue?