If you use 100% synthetic, and change it every 5 to 7500 miles, you'll never have to do an engine oil flush.NYC said:Just bought this car and went to change the oil and oil filter. The mechanic found the oil very dirty and recommend the engine flush to clean it up. Not knowing the service history of this car so I did what the mechanic recommended:
- Engine Flush
- Castrol Synthetic oil 5W40 (8 Quarts)
- Change oil filter
Total bill = $150 and he recommended using synthetic oil every 5k miles and engine flush every third oil change.