I hv some unused semi syn and fully syn engine oil..

In good condition as bottle is sealed tightly for more than 5 years..

How to dispose them ?

Donate to others.

But where to find ppl who want my used engine oil ? Carousell ?

Yes, if you sell cheap cheap ppl will buy to put in their kapcai even though its 5 years old.

If you don't want these oil, you can go to a workshop and as them to dispose.

Workshop sell used oil to recyclers by drums.

go to your nearest car workshop

I mixed 60% used engine oil with 40% diesel and use it on old mechanical diesel engines like gensets or really old lorries. Works wonderfully. Lots of black smoke though.

Does this concept work with used cooking oil + diesel?

Yes. Lots of white smoke though.

Just go to a nearest workshop and dispose, they are damn happy as can sell it afterwards.

I've done it once, brought to the workshop nearby my house then they help me dispose the engine oil

The engine oil been found in my store room, so decided to get rid of it at the right way