i don't do many miles a week only about 100 on averaged. but just returning from holiday and covering 2000 miles it drank 1 1/2 litres of oil over the week is this some think to worry about.
[/color]If you only do some 160miles a week, there is a tendency the engine will never get quite warm. This in turn increases the likelyhood of the engine oil being diluted with petrol, water (condensation & combustion derivative) and anything else normally "blown" out by a hot engine.
If the engine then at some point is run hot, the oil is "burned" clean - i.e. most of the collected gunk will simply vapourise and disappear by the long hot trip. This shows up as the dipstick level decreasing.
I'd say that just up to the limit of 0.5L/1000km = 0.3L/1Kmile is "normal" even for a new engine. Usually this is also exactly the disclaimer note found in your owners handbook.
Of course this figure raises up to the non-acceptable level as the engine ages.
It is also a MUST that you gauge the dipstick level under EXACTLY the same engine conditions every time - to avoid mis-readings :
either engine over-night cold before you start
or
engine warm when arriving at work - but at least 5min after engine turned off to allow oil flowing back down the sump
- and ALWAYS on exactly level parking ground
If you dont follow these simple rules, you can very easy mis-interprete the levels read as different as 1L !