Just had the sump off to cure a leaking gasket and found that the dipstick tube itself has snapped/broken.
I had the bottom end balanced when the engine was last stripped down but suspect there is a vibration resonance spot which has fractured the pipe.
I have had numerous problems with sump leaks, sump plugs and oil temp sensor working loose which all seems to point at a vibration
Anyone else had this problem or any alternative explanations?