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Yes it's just good procedure to do it close to an oil change so it doesn't have the chance to thin your oil.
It might not get the the oil but people always say there is a chance.
Iv'e used it a few times I saw the most improvement on a port injection car. I think our direct injectors work or don't.
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2015 435i grand coupe xdrvie (current)
2006 F250 powerstoke CCSB (current)
2014 M235i Black on Red (SOLD) / 08 e90 335i MT Pure Stage 2 High flow (SOLD)
08 128i 6MT (SOLD) / 08 335i 6MT Pure stage 1 (SOLD)
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