I've seen Mercedes do it
I've seen Mercedes with flame from the exhaust, but for a different reason. If you take a Mercedes such as an early '70s 280SE 3.5 or something similar (early 350SL etc.) with D-jetronic injection that has spent most of its time doing short city trips, it will have considerable carbon build up in the rear muffler. If you then take that car on a fast (wide open throttle) highway run and suddenly lift off the throttle, it is possible that the carbon in the rear muffler (which is now very hot) will ignite. It ignites on the overun due to excess oxygen in the exhaust gasses because the D-jetronic shuts off the fuel on overun. Opening the throttle again will extinguish the fire. Flames are not common under these conditions but a trail of whitish smoke on a closed throttle is. Once again, opening the throttle stops the smoke.
107.023: 350SLC, 3-speed auto, icon gold, parchment MBtex (sold 2012 after 29 years ownership).
107.026: 500SLC, 4-speed auto, thistle green, green velour.
124.090: 300TE, 4-speed auto, arctic white, cream-beige MBtex.
201.028: 190E 2.3 Sportline, 5-speed manual, arctic white, blue leather.
201.028: 190E 2.3, 4-speed auto, blue-black, grey MBtex.
201.034: 190E 2.3-16, 5-speed manual, blue-black, black leather.