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Two stroke or four stroke engine. Tecumsen Centura S Mowing machine?

I have a simple petrol driven mowing machine which you push from behind. All of the oil came out accidentally. Do I replace the oil with two stroke oil OR four stroke oil
The machine is a Tecumsen Centura S Auto Drive and costs about £130 about six years ago.

Is the engine a two stroke engine or four stroke engine?
gordoriley@hotmail.com1, April 2008
NO!!!!

10/40 oil + Tecumseh engine = broken con-rod

Tecumseh specifically say do NOT use 10/40 oil. 20/50 is OK at a push, but straight SAE30 grade is recommended.

phil_saunders@bigfoot.com

Phil Saunders, May 2008
Four stroke engine - use either 10/40 or 15/40 oil and you'll be fine.

John, April 2008