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If you're changing your coolant (as you should be) and using OEM thermostats (as you should be) you shouldn't have any problems with heat. Your underhood temps will probably be high with this car in this climate though. Did you say yours was the 5cyl or 6cyl? The sixes are known to be very hot.
Be sure to try to keep your rad clean too.
IIRC the splash guard pan thing you are referring to should actually HELP with engine cooling by directing more air through the rad.
AutoRX seems to be the best remedy for engine sludge, but a good oil will clean it up slowly over time (years). If you were having a shop do 'synthetic' oil changes they were almost certainly not using 'real' synthetic. In some parts of the world there are stricter rules about what is allowed to be called a synthetic, but in NA it's pretty crappy. Most 'synthetics' - even most viscosities of Mobil 1 - have very little real synthetic oil in them, and are actually highly processed petroleum oils. And as such they are HIGHLY overpriced.
As I mentioned in a previous post on another thread I am going to be switching to a diesel oil to benefit from the higher detergent, TBN, ZDDP levels, and the associated cleaning and protection that come with them. Diesel oils fit the 'turbo' bill quite nicely, and the quality oils are much less expensive.
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1998 V70 AWD->FWD Turbo 200k+
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