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After recently buying a 955 with the V8 which is whisper quiet with a full history, I decided it was a good idea to change the oil, filter and the plugs as it had only moved 400 miles in six months.

The oil was a suggested Mobil 1 0w40 and the plugs are as identified by the reg plate.  

However, the Bosch super 4's that came out were R6 (resistance) and the BERU 4's were R5.

ive not noticed a loss of power - but HAVE noticed a drop in my mpg figures.

from 17-19 down to possibly 13-14.

anybody else experienced this, the oil level is correct with a quality synthetic filter by K&N and the spark plugs were torqued to just on 22 ft/lbs. 

appreciate any feedback on your experiences. 

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I just put in the same Bosch plugs last week. Blue right? I was concerned as well about my old green plugs having an R5 vs the newer one's R6 stamped on them. Called Bosch yesterday and a tech promptly returned my call. The R number is simply ohm resistance (reduce electrical interference) and nothing to worry about. As far as decreased MPG. Yes. I live in Chicago and cold air can reduce MPG by as much as 20%. It's subzero right now...

2009 Cayenne S

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