I have heard that Toyota 121 engine has a greater possibility of forming engine sludge in it.
Can you: (a) give your views on this
( give suggestions to prevent sludge formation
I was told by somebody that using 95-Octan Petral is bad, as it helps the sludge formation. How true is this statement?.
If it is true, then all 121 users better change to 90-Octane rather than paying a premium price for 95- Octane which eventually contrbutes towards damaging the engine.