I tried it in an engine that had some 365-370000 kilometers on the odometer, at that time.
Restore did not do anything at all with oil burning, MPG or the way the engine performed.
Since it is quite cheap, go ahead and try it, you could be lucky.
I haven't seen it has done any harm, either.
Several users seem to have seen positive results, with it.
Tell us if it does anything, or not.