Let's solve my 20V conversion problems

[jondee86]

The primary cause of excessive oil consumption is worn oil control rings.
Once the oil control (oil scraper) rings lose their ability to clean excess oil
from the cylinder walls, an ever increasing amount of oil becomes part of
the combustion process. Blue-grey smoke from the exhaust is a sure sign
of bad rings. If this was your problem, then it would not matter what kind
of oil you were using.

A secondary cause of oil loss is oil vapour carried out through the crank-
case ventilation system by excessive blowby (also caused by worn rings).
This oil also finds its way into the combustion process.

If the engine is in good/average condition, I would consider adding a litre
between changes (@10,000 km) to be acceptable, and having to add a
litre every 1,000 km to be excessive !!! Anecdotal evidence seems to
indicate that using a thin fully synthetic oil on a good/average condition
20V engine can double the oil consumption.

Incidentally, by now your engine should be fully bedded in, and you
should be load cycling it to redline. After a 1,000 miles you could run a
semi-synthetic and expect to add not more than a litre between changes.

Cheers... jondee86