Any particular pattern to the "sometimes" ? Eg if it only ever happens when you take off hard after idling for a while (eg at lights) then it might be valve seals.
Is your engine's performance (power) consistent and OK, or does it vary or is it a bit slower than other cars with the same engine and gearbox ?
Does it use any oil, and does it use more around town or in highway running ?
2017 MY18 Golf R 7.5 Wolfsburg wagon (boring white) delivered 21 Sep 2017, 2008 Octavia vRS wagon 2.0 TFSI 6M (bright yellow), 2006 T5 Transporter van 2.5 TDI 6M (gone but not forgotten).
I noticed after a few days of revving past 3,000 in gear shifts, seems to be less smoke now. Maybe just needed a cleanout!
Jeep Patriot CRD. Same Same, but different...
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