That is my question. In all my years of doing my own oil changes I've never used an engine oil flush.
I am wondering weather I need to or not to when you see how bad some toyota engines suffer from a tar like substance. I don't know what oil was used in the last couple of services so I have bought toyotas 0w20 as recommended, any info on oil flush and if there's a brand that works better than others.
Thanks in advance.