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RB25DET strange oil reading

Hi all ive encountered a bit of a strange issue in my 33. Ok heres the scenario. Last week started it up to go to work car started ticking like it had no oil so i shut it down and went to check the dipstick to my horror i found it was just under the low sign so i topped it up.. and went on to work. Being parranoid of burning oil i checked the level once i got to work which is a fair distance of about 55km it strangely read above full. Since then ive been monitoring it day by day on the 4th day i noticed it droped to about 3/4 full and by the 6th day in the morning i checked it it was at the low sogn again. I had run out of oil to top up so i head over to the local parts store to buy some more then went home i got distracted and had to do a few things but once they were done i proceeded to check my oil level again to my dissbelive i found the oil level at the full mark. Could i have possibly have a blockage? Have anyone had this issue? Its a 95 s1.5 un opened engine with 150xxxkm all bolt on and suport motor 330kwatw gt3582r no sump mods definently the original dipstick

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Are you parking it on a flat surface when you check it? What grade oil?

Ive checked mine on my driveway, which has a slight slope before and oil was low. But back on flat ground was fine

I know its simple shit but have to start somewhere. Thicker oil takes longer to drain back. Give the first situation in your story the oil was cold may suggest not all the oil had returned to the sump. If it were me, i would check it, drive it, park on flat ground and after a while check it again.

Do that a few times. Check for blowby etc.

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