I would take the car to Enrique and pay him to check the chain and tension for stretch. He removes a valve cover(passenger side and looks at the chain and upper guide. then does a stretch test if warrented.
On Abigail we knew the Chain had never been replaced and it might be a single row chain. So he did the check and test. It was a double row chain and the stretch wasn't that bad yet, but I opted to change out the chain anyway.

If you'd like I can come down and check under the valve cover and all it'll cost is the price of valve cover gaskets. It doesn't take that long.

Also on the locks on the wheels, I believe they are Centra wheels Right? if so I think they are either a 3 leaf clover pattern or a 4 leaf pattern. A flat screw driver of the correct size will get the locks lugs loose(a hint from the tire guys at Affordable tires in Palmdale Ca). I watched them take my wheel off as I was looking for the key.........so much for being theft proof.

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1986 Euro 500SEC "RUF" 9:1CR, "Rose"
1985 Euro 500SEC Cabriolet AMG Widebody
1982 Euro 500SEL "Blue"
2001 Texas Heeler (Aussie/Queensland X) "Sulphie",
2012 Queensland Red Heeler "Squeak"
Best dogs I've ever had.