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I know there is a dipstick available that can be used on the V6 gas engines - someone documented it here. It's not a permanent installation, but would be useful when changing oil.
I was looking for some info in the 958 service manual, and stumbled across the following - in a section on the V8 engines (V8 and V8-turbo):
So of course this is going to send me off onto parts websites..
Could it be? A dipstick on the 958 V8, or just a lazy service manual author who borrowed a diagram from the 955/957 series cars?
I got a VW dipstick for my Cayenne Diesel. The engine came with the dipstick tube in place and a small plug blocking off the dipstick tube. Perhaps you can see if there is a dipstick tube installed on your engine but not used. I doubt it though. The diesel engine came from Audi/VW where some installations did not use the electronic dipstick. I don't think your V8 was used anywhere else. The dipstick is a wonderful, time saving device.
While I find it weird to not be able to check my oil with a dipstick, I don't really long for one on the TT. I change the oil and add exactly 9.5 qts every time. It always hits the full mark and never needs oil between changes. Electronic gauge works fine for me.
Interesting. Seems like you should be able to get one if the tube is already there. I was able to buy one for my Audi from ECS Tuning (doesn't come with one either).
@deilenberger Did you ever solve this mystery from the parts picture?
Yes and no - yes I looked at the parts picture for the earlier V8 engines (955/957 with dipstick to see where they went into the engine) no - can't be done on the 958 V8 since the hole isn't in the block where the dipstick would have to go, and I believe some of the stuff on the front of the engine would get in the way of one anyway if there was a hole.