Swapped out the starter and AOS. Starter has been squealing since last winter and I've had the AOS hanging around since I got the car so I figured I'd swap it now. Took me about 5 hours for both, not terrible, but not great haha. Picked up that 20" extension to make it easy. I also noticed some buildup around the power steering reservoir and the rear of the intake manifold. Planning on flushing/replacing power steering fluid as soon as it comes in, but how concerning is this build up?