Just hold a Denso in one hand and hold a AC Delco in the other. Just buy looking at them and holding them you can see the difference in quality.

They have a stainless steel housing, double protection layer, aluminum-oxide trap layer, and a porous PTFE filter.

Because of the PTFE filter the 02 sensor will have superior emissions control, low operatind differential pressure, higher air flows, the ability to recover from upset conditions, and an improved service life. Meaning your 02 sensor will be more sensitive but lower false alarms, and is cable of 60+ switch counts per second which far exceeds an AC Delco while having a longer life span.

Because of the aluminum-oxide trap layer your sensor is less prone to false readings or failing because of contaniments. They go as far as to say you can run leaded gas.

First off in my car I replaced my 110K OEM unit with an AC Delco then replaced that with a Denso.

All that stuff is great above but what results did I get? In short I gained 2-3 MPG which got me 30+ Miles more per tank. My fuel trims evened out more and were not all over the place - prob. the reason for the better MPG. Also I have around 15 gallons of leaded gas through my car and no side effects.

I'd stick to AC Delco for the O2 sensor since we all know its more capatible with our Bonnevilles, I spent $110 on a Bosch O2 which the counter-boy handed to me and it was a waste of my money because I had worse milage, I bought another O2 that was AC Delco over the same counter, for a cheaper price and it actually worked, it gave me almost another 50-70 km'* on my tank. Funny thing was, they were gonna give me another Bosch, but I specifically asked for the AC Delco.

Did some cleaning in this post..
Blazin and company...1/4 times post has been moved to lounge..

Thanks Matt I didn't want to add to it being off topic but I was asked directly.

My Denso 02 sensor was over double that $33 price so I'd consider that a steal. I dont know what is ment by saying "more capatible". Denso are just as capatible, work better, and last longer.

Sounds like we may have another alternative, then! SWEET!!!

PS, who said anything about Bosch? This thread was specifically titled Denso. The topic probably shoulda stuck there...
/soapbox

Denso 02 sensors will work just fine and in fact are more lead tolerant than any other brand that fits our cars. I would not hesitate to use either Denso or AC delco in our cars.