Engine flush or not

irecknso

Original poster
Member
Feb 16, 2012
25
Getting ready to switch over to synthetic oil, do I need to do a engine flush or not? '03 TB has 95000 miles
 

meerschm

Member
Aug 26, 2012
1,079
Your decision. I would just do an oil and filter change.

if you think your old oil is really nasty, you could do a flush. I don't think it is really needed.


Mobil agrees:

Synthetic Oil | Myths

Myth: I need to flush my engine before switching to Mobil 1 synthetic motor oil.
Reality:
No special preparation is necessary when switching from conventional motor oil to Mobil 1 or Mobil 1 Extended Performance synthetic motor oils
 

CaptainXL

Member
Dec 4, 2011
2,445
It is not needed but recommended for higher mileage engines over 75, 000 miles and/or have a questionable service history. If you dont do a flush on an engine with questionable maintenance the first fill of synthetic is going to get dirty really quick and require changing earlier thus wasting time and money.
 

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