Egr & Oil Catch Tank

[fi5hy]

Dear friends,

i owned a Lexus IS220d bought from the UK. It already has 70000 miles on the clock. Im from Brunei Darussalam, ASEAN region fyi.

Ive been using the LiquiMoly 5/40 motor oil before then i change it to Voltronic 5/40. since then i've got problems. it started to lost power with the VSC/Engine Check/Traction Control light up. After making some research, i can solve the problem with the EGR by cleaning it. All the particulate/soot builds up in the EGR. but by cleaning only will not solve the problem 100%. After about 1000+ miles, it start to come back again. for about >5mths, i assume that the motor oil that im using (voltronic) is not suitable for the engine and recently i changed back to LiquiMoly and hoping that it will solve it.

the question is, is it the right thing to do if i install an oil catch tank? i googled the function of it and they mentioned that it will trap the soot/particle in it and only pass cleaner fume/gases back to the engine intake for recommbustion. is it correct? correct me if im wrong.

Thank you, would be happy to hear for your response.