The Revision 3 TSB (05/14/2018) is the first time it provides a Production Solution (check valve and screen).
Revision 2 TSB (11/21/2017) adds the the new 079115175G Oil strainer.
Revision 1 TSB (2/2/2017) has the older 079115175F Oil strainer.
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================ Revision 4 ==================
21 Engine difficult to start, turbocharger damaged, V8 4.0TFSI
21 18 29 2044640/4 May 22, 2018. Supersedes Technical Service Bulletin Group 21 number 18-28 dated May 14, 2018 for reasons listed below.
Production Solution
Optimized oil strainer 079115175G for oil supply lines to turbochargers in the cover in the inner valley of engine. The oil strainer and check valve 079103175C must always be replaced to ensure proper oil flow to the turbochargers.
4 - Revised header data (Added model years)
3 - 05/14/2018 Revised header data (Added VIN breaks for 2017 models)
Revised Production Solution (Added information)
Revised Service (Added Note and updated Step 7)
Revised Required Parts and Tools (Added part numbers)
===================== Revision 2 ====================
21 Engine difficult to start, turbocharger damaged, V8 4.0TFSI
21 17 27 2044640/2 November 21, 2017. Supersedes Technical Service Bulletin Group 21 number 17-24 dated February 2, 2017 for reasons listed below.
2 - Revised Required Parts and Tools (Updated quantity and part numbers)
Production Solution
Not applicable.
Also mentions: 079115175G Oil strainer
===================== Revision 1 ====================
21 Engine difficult to start, turbocharger damaged, V8 4.0TFSI
21 17 24 2044640/1 February 2, 2017.
Production Solution
Not applicable.
079103175C Check valve
079115175F Oil strainer
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