Do any of you guys use any sort of oil additives in your tt's. Do they really help the life of the turbos or do they have an adverse effect?

 

As long as you change your oil and filter frequently, 5000-7000 miles, do not worry about it.

 

right. Oil companies already do all they can to find and use
whatever oil additives they can, to improve lubricity, acid
reduction etc. Just use the best oil in the viscosity Porsche
tells you to. Aftermarket additives are almost universally
placebos or worse.

 

There have been some bad additives in the past, such as the Teflon additives (Slick 50) that gummed things up, elemental moly additives that settled out and clogged oil filters, and chlorine containing additives (duralube) that corroded brass engine parts. Recently most oils have reduced their anti-wear additives to ensure that the catalytic convertors last 100,000 miles. I think it's a good idea to add some of these additives back to today's oils. Mobil 1 0w40 now has about 800 ppm ZDDP where it used to have 1050 ppm. One good additive is General Motors Engine Oil Suppliment (EOS). It has a highly concentrated amount of ZDDP as well as other anti wear and acid neutralizing chemicals. ZDDP is the standard anti-wear, anti-friction additive used in essentially all motor oils. EOS has over 6000 ppm ZDDP so you only have to add 1 oz./qt. to bring the new Mobil 1 up to 1000 ppm ZDDP. EOS is available at most GM dealer parts departments for $8/16 oz.
Another good additive is Valvoline Synpower Oil Treatment. It contains 3400ppm soluble moly, 2700 ppm ZDDP and 1400 ppm boron (a newer anti wear chemical). It's $4/15 oz. at Pepboys
Disadvantages:
1)not approved by Porsche
2)cost
3)thick additive base oil thickens your oil a little
4)if your car burns oil the additives can foul the spark plugs or cats
5)slight chance of chemical incompatibility (very unlikely)
6)You have to go into a Pepboys or chevy dealer to buy it. You could see a new Corvette there and decide you really need it. You may have to run the guantlet past the salesmen to get to the parts department.