The PG unit has some years on it (2002 or earlier) and most importantly it is a copy of the unit that is available for Mercedes vehicles. Please look at the KLEEMANN units available for their cars (upgrades). www.kleemann.dk/site/main/accessories/lsd
If it is good for them (MB / AMG V8 & V12's) then maybe you might check them out. Works for me and the rear gear fluid is totally clean , no wear showing for me, gotta do the research.
Enjoy
Woody
The KLEEMANN Limited Slip Differential is available for all Mercedes-Benz models fitted with a "large housing" differential case. This means all models with V8-, V12-engine and the new SL 65.
V8 & V12 Mercedes-Benz models
Overflow of engine power is no good if it cannot be transferred into wheel traction. Therefore, KLEEMANN has developed a Limited Slip Differential (LSD) with a 60 percent locking mechanism, which means that the mechanical devise applies a 60 percent lock-up ratio between the two drive wheels. In contrast to a standard ESP-system a Limited Slip Differential (LSD) is a very sporty and high-performance approach to control wheel spin thereby improving the car's traction.
At no time will only one wheel receive all the engine's power, and by powering both drive wheels at the same time, the engine acceleration power is distributed more evenly, hence reducing wheel spin and in the end lowering acceleration times significantly.
Using the KLEEMANN Limited Slip Differential (LSD) gives an immediate result. Testing has shown that a Mercedes-Benz 55 AMG will drop as much as 0.3 second to 100 km/h (0-62 mph) with this modification alone!