Thread: Cold Oil, Oil Change

I think the main idea is that any debris in the oil will be mixed in again by the churning about of the engine, gears or whatever and not maybe rest in the bottom of the sump/gearbox.

I usually drive my car around the block so the oil is warm not hot , which I think is enough to suspend the debris.
Regards Philip A

No, it just flows better when its warm (not hot) so it comes out quicker. I usually do it after cooling down for a few hours after a run so as not to remove any skin from my body.

I don't think there is much advantage, when it's cold most of the oil has all drained to the sump anyway.
What I do do is open the filler cap before I drain the sump, this increases the flow out and introduces a flushing type effect.

I guess the ambient temp might come into play if it was really cold.

Paul.

Originally Posted by PhilipA

I think the main idea is that any debris in the oil will be mixed in again by the churning about of the engine, gears or whatever and not maybe rest in the bottom of the sump/gearbox.

I usually drive my car around the block so the oil is warm not hot , which I think is enough to suspend the debris.
Regards Philip A

This is my theory too.

Originally Posted by rick130

This is my theory too.

And mine...only drain cold if unavoidable.

Regarding gearboxes/transfer cases, a wise person once told me to remove the filler plug before you drain the oil.
When things don't work out as they should, its not easy to refill back through the drain hole.
mike

Originally Posted by llandro

Regarding gearboxes/transfer cases, a wise person once told me to remove the filler plug before you drain the oil.
When things don't work out as they should, its not easy to refill back through the drain hole.
mike

What a good idea!

Originally Posted by llandro

Regarding gearboxes/transfer cases, a wise person once told me to remove the filler plug before you drain the oil.
When things don't work out as they should, its not easy to refill back through the drain hole.
mike

I was told that as well,

And the wise guy also added,always check the level at the same time,before draining any oil,it will give you an idea if anything is going on.