Once you get the engine to run, if the engine is blowing a lot of smoke from the exhaust, your cats are toasted. Oil Contamination of any type will coat the catalyst and render them useless as will using any Teflon or Silicone based products on any exhaust parts or assemblies as they will contaminate the oxygen sensors and cause the miscalculation of the fuel trim.

In the states, you can not buy a used cat from a junkyard, since there a a federal law against the sale of used cats. Looks like a LOTUS (Lots Of Trouble Usually Serious).

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2006 Infiniti G35
2001 BMW 3.0I E53 X5 Build date 08/2000 SOLD
Lotus Europa 1970 Destroyed by fire
Lotus Europa 1970 S2 Renault Powered
Lotus Type 52 1970 Twincam Webers Powered
PORSCHE 911 Targa 1982 The Garage Queen
Audi Avant donated to Kars for Kids
BMW 525IT Sold
Audi 4000CS Quattro Sold
Jensen Healey Lotus Powered Sold
Opel 1900 Sold
Triumph Spitfire 1971 Sold
Triumph Spitfire 1968 Sold
Plymouth "Cuda" 340 Six pack SOLD