Hello Scotty and the community! I have a 2006 Mercedes S65 AMG (W221 generation) with 5-speed auto and 70k miles as a weekend toy. It has run troublefree for the past 10k miles that I've owned it, even at 190 mph everything is troublefree. Since I'd love to maintain it properly and it has this ABC chassis with oil in it, I was wondering what your opinion on this is, does the oil need a change or not? Mercedes claims not, but they also claim it only needs one transmission oil change at 40k miles and then never again. Some say (for the ABC oil change) every 30k miles, some say every 50k miles and others say every 100k miles. Whereas my dad and my mechanic say it's better not to touch anything, in order to not cause potential issues where there haven't been any. Apparently it is known that with these W221 (unlike W220) that ABC chassis is just as stable as any other chassis, but it's just absurdly expensive when it finally does break and changing the oil can extend its lifespan. What is your opinion?

Have a great week you all!