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Messages posted by: AeroSonic
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New member. I just bought a 2016 Grand Cherokee EcoDiesel primary for its balance of fuel economy, towing ability and utility as an SUV. I just found out about the GDE product, and if it will boost my fuel economy even more, I'm definitely interested, but I have a few questions.

1. I bought my Grand Cherokee on 20 Jul, and on that day there was a service bulletin # 18-078-16 telling dealers to remove the 5W-30 oil and switch it to Rotella 5W-40 and reprogram the PCM. My vehicle is covered and have an appointment to have that done. Does GDE need to change the programming of their ECM, or is it good to go as is?

2. I was also looking at installing a K&N 63-1570 air intake. Would that and the ECM help boost fuel economy or will the ECM alone do that?

3. Lastly (and this is probably discussed somewhere), what is the negative tradeoff for swapping out the ECM (other than the initial cost)? Installation voids warranty if the dealer finds out?

 
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