Thread: Can changing oil types cause oil consumption?

Originally Posted by Dougal

There is one big reason the 4BD1T's have oil seperators and the 4BD1's don't. It's the oil squirters under the pistons. These create a huge amount of oil mist which is carried out the breather.

The non turbo motors don't have the piston squirters and hence don't have (don't need) a factory external air/oil seperator either.

That would explain the oil carryover in Tdi's too. (or any TD with piston oil cooling)

Originally Posted by Dougal

There is one big reason the 4BD1T's have oil seperators and the 4BD1's don't. It's the oil squirters under the pistons. These create a huge amount of oil mist which is carried out the breather.

The non turbo motors don't have the piston squirters and hence don't have (don't need) a factory external air/oil seperator either.

4BD1s do have a (crude) separator. IME even turbo diesels without piston cooling produce a healthy amount of oil mist.