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No one uses the oil level gauge for exactness, it only gives an indication of level when the car is fully warm and stopped on a level flat surface. Driving it barely registers, that's normal.
I suspect you know to only check your oil with the motor running, fully warm and sitting still for 30 sec or longer on a level surface.. Never fill to the top mark, only 1/2 between the marks.
Keep track of your oil usage but 1 qt. for 800 miles is ok and does not indicate action on your part.
I had a 930-16 (US spec 3.0) that ran great with good leakdown that got about 600 miles per qt. and I drove the hell out of it no problems. Every indy shop owner that drove it said 'just put more oil in it' as it drove so well.
When they get a bit south of 600 mpQ (some say at 300) but it's a personal thing depending on your professional source then you should deal with it.
The bottom ends are good for 3 to 400k no sweat if the oil is changed regularly.
If it was leaking badly you may have dripped more oil than you used so you might be better off than you suspect.
Use a good zddp oil in the proper weight and change it every 3k....then they seem to run forever.
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