It isn't "normal", it is just stated as acceptable and is actually 1000km, not miles...
But if you are actually using 1L every 625 miles (1000km), then there is a problem.
It would mean you would be adding over 19L of oil between services.....
Yes, that sounds about right. I'm using 1L every 500km.
The day I bought my car, I checked the oil and it was 'half'. By the time I got home the next day (10 hours of driving), there was no detectable oil in the engine (had to top up with three litres bought from the local garage, Castrol GTX Protec).
I changed the oil (to Valvoline Engine Armour 15W40) and had a bit left over (five litre container). A week later, I had to top it up, using up the rest of the container. The week after that, I poured in some leftover Castrol Edge from my Punto's oil change. The week after, a litre of Magnatec that was leftover from some other oil change. This week, I cracked open a new container of cheap 20W50 oil and used a litre. I'm beginning to wonder if 'TS' stands for 'Two Stroke'.
My Suzuki scooter, which IS a two-stroke, uses a litre of oil every 4000km. (I bought that new in 2003, used it intensively for a couple of years when I commuted to work in town. Nice little 50cc motor).
This is ridiculous. All other cars I've owned have needed scarcely one top-up in the 8000km between my annual oil changes. I have oil sitting around for years unused. So far, the 156 has used four litres in a month, and I've only done just under 2000km (which is quite a lot for me, obviously I've had several long trips to show the car to friends
). In a typical month I'd do about 600km. Between 8000km oil changes, the 156 is on track to use about 16 litres.
I'm fairly certain I must be holding the record for oil consumption. Engine is a 2L Twin Spark, with 240,000km on the clock. I know that's a lot, but I've had engines before with more kms and less oil-burning. My 20-year-old 164, for example, with 250,000km on the clock, is relatively thirsty but even that uses only 1L/3000km, one-sixth the consumption of my 156. My Uno FIRE was more in the region of 1L/10000km.
I've decided to take the head off my Twin Spark and get the pistons out, some time in the new year once I've got my two 164s on the road. There must be something hideously wrong with the piston rings and maybe a big ridge in the bore, collapsed piston skirts, who knows... The (new) spark plugs are still clean and I don't see smoke behind me - perhaps the catalytic converter is 'afterburning' it?
I get the variator noise only on a hot start, so I'm also wondering if that gasket leak could be a factor - would it make THAT much difference though? - and, there's no smoke when the engine starts. The spark plugs on No. 1 look no different to the other spark plugs - they're all white. My 156 is very economical - 6.7L/100km average of town and highway - perhaps the lambda sensor is making it run super-lean to compensate for all the extra oil being burned