Quote:
Originally Posted by JFP in PA
The direct injection systems on the 9A1 engines add a complication that rear's its ugly head as bore scoring. DI engines suffer from cylinder wall "wash" during start up and cold running; as such they need an even better oil designed to deal with this phenomenon, like the Joe Gibbs Driven DI 40, which carries additional moly along with the ZDDP. 5 K miles would also be the absolute limit on these engines.
Changing the thermostat on some of the 9A1 engines is also somewhat more complicated and many used a complicated "thermal control unit". Fortunately, LN has produced a 160 F unit specifically for these cars from 2009 to 2012. Later cars use an completely electronically controlled system for which there currently is no replacement.
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Thank you for the comments JFP!
I installed the center cooling radiator to help preserve the health of the PDK as well, and hopefully the previous owner took good care of the engine but this would surface later if he didn't (hopefully not with scored cylinders), thanks again!