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Originally Posted by spine911
I totally agree with the above....
IMO, the solution is an easy one....I would (and i always do-regardless of whatever car i have, and oil i use) change my oil at closer intervals rather than sticking to the dealer recommended oil change interval. This way i know that there are LESS contaminants, and lesser chance of sludge formation.
Dino oils have a recommended oil change interval of 3k miles (which was the common accepted "rule" for decades)....With the advent of better Synth oils the "average" oil change interval is around 10k miles ......I personally change Synth oils NO MORE than 7k miles this way i know that i am always below the recommended interval.
BTW, engine design could, and can also contribute to sludge formation (crankcase breathing design, etc....etc).
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Don't forget about the air filter. I almost did. I never thought that would help until I started doing some research.