Mercedes-Benz GLK350 4MATIC Questions

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I cleaned throttle body and changed PCV valve
Please let me know what this could be as Carmax is saying that my extended warranty does not cover brakes
85k mi. Changed oil, after 2k mi. Message says check oil. Checked oil none on dip stick. Added oil to normal level. 3 weeks later and minimal miles driven, same message. Checked oil and none reading. Cranked engine to check running and it started showing half on dip stick. Why was it dry when checked hot the first time and dry when checked cold the 2nd time 3 weeks later?
Purchased a 2015 GL450 July of 2015. Love the car but the engine braking at speeds under 20mph is driving me crazy. It is bothersome and dangerous. In stop and go traffic I let off the brake and the car continues engine braking, when the traffic moves and I step on the gas it jumps because it was engine braking. Does anyone know how to make it stop. I had it back to the dealer 3 times and they said it was normal.
Everything works
Continental ecosport5 Tyres are tested and replaced. No joy. No difference on tempreture or use of nitrogen. On perfect flat tar the noice is gone. The slightest uneveness is picked up. It is like a resonance that travels through the vehicle. I drove two other new ML's. One did the same and one not. The one that didthe same did not have 4matic and had Mitchelins on.
Has happened 3 times. First time they said they could not find anything.
Second time they replaced the shift mechanism.
Just happened again today.
This is the third time the car could be shifted out of park in 3 weeks.
Only when car is not driven for a couple of days.
when the car sit over nite and I start smoke comes out from tale pipe
Car just started to blink its front running light and rear tail light and cannot get them to go off
We are changing the windshield and have not done one of these before, just looking for any helpful tips.
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