I have a 7 yr old diesel ford fiesta. Lately engine noise and vibration had increased a lot. Then tried this in my engine oil.
Using it is really easy just warm the engine, turn off, add dado, idle for 5 mins. That's it. It starts work as you drive. It takes 1000 kms for it to fully coat the engine from inside.
Now the noise and vibration had all gone.Mileage too has gone up by 20%Must buy for old cars.