Roughly 2 months ago this message popped up

"OIL LEVEL LOW, FILL OIL" - oil was full to the brim

2004 V70

Had a read around and the consensus was not too little oil but low quality oil... no worries.

Did due diligence - changed the oil (had the car for 6 months, so no idea what was in there) oil change as stated in the manual and on here.

No more messages until today... then "OIL LEVEL LOW, FILL OIL"

Checked the level... nearly at the top of the marker... so popped in a few extra drops... now at Max

Hot engine - message "OIL LEVEL LOW, FILL OIL"

What next --- faulty sensor... easy/hard to do?

Now to throw a spanner into the mix.. LPG conversion (2005)... make a difference?

Advice.... please!