Silly question here but how can I tell the difference between a S4 and a S5 turbo engine?Thanx in advance Chad

 

This question has come up many times in the past. The 'search' function needs to become your friend.

If you're looking at a longblock, a quick way is to look at the metering pump. If it's a small, mechanical pump with a metal rod that goes to the throttle body, it's an S4. If it's larger and has electrical connections, it's an S5 engine. The thermostat housing is plastic on an S5 engine and aluminum on an S4. If you're looking at a shortblock, look at the metering pump flange at the right side of the front cover. If it has 3 mounting holes for the pump, it's an S5. If it only has 2 holes, it's an S4.

 

I did attempt to search the forum iwth title like"s4 vs s5" and "difference between s4 and s5 turbo" but I had no luck,maybe I'm doing something wrong but I don't know what.Anyhow thanks for the info and it turns out I've got a s5.Perfect...Thanx Chad