On Alfa number 15
AO Platinum Member
Join Date: Dec 2005
Location: United Kingdom
Re: Anyone found a cheap online oil supplier
I always thought the valve stem seals leaked mainly when the engine was cold, hence the puff of smoke on start up..?
They usually leak when the engine is turned off and oil is allowed to drain back to the bottom of the engine, some will seep past the seals hence the puff on startup. The oil is still hot at this time and runs past the seals more easily.
It can also run past the seals when the engine is running, except you tend not to get as much smoke because the oil is leaking through and getting burnt continuously instead of in one go.
When the oil is cold most of it will be in the sump, and the small amount that remains at the top of the engine will become thicker.
Hope that makes sense..
You will never be cool driving a Vauxhall.