Hi, there is a bug where you can convert any oil into any other oil using the output pipe.

1) have crude oil on shared storage
2) have petroleum on shared storage
3) lay down 1-3 normal pipe
4) attach 1 Linked Output Pipe on the normal Pipes
5) choose crude oil on the Linked Output Pipe
6) wait for normal pipe to have crude oil on it
7) select Linked Output Pipe and choose Petroleum
8) see your petroleum quantity decrease and crude oil increase on the shared storage.

you can also do this on light oil, heavy oil, lubricant and sulfuric acid