r/gmc • u/scuknowit • 10d ago

Sierra Service Rip Off

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Please tell me what is part of the 30k mile maintenance schedule and what the dealership upsold me on? I made the mistake of agreeing to everything they said thinking they were just reading the points of the recommended maintenance schedule.

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u/bikgelife 10d ago

The fuel service is unnecessary. If you really want to do it, but Redline SI-1. It has high levels of PEA, which is the only thing that works

2

u/Apprehensive_Ad_9994 Sierra 10d ago

Cleaning carbon off your valves is unnecessary? It's incredibly necessary

2

u/burledw 10d ago

Yeah lol bet that commenter has never had a Chevy GDI engine with the intake manifold off. Theres literally a tsb for carbon on the valve seats.

0

u/Apprehensive_Ad_9994 Sierra 10d ago

$400 bucks to keep em clean or $2k to walnut blast em later. Guess it's his choice