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Saw an episode of "Two Guys Garage" where they showcased an Otto tester that displayed the pre-Cat O2 sensors on a '04 Corvette with about 60K miles. One of the guys looked at the waveform and said: "That's too slow" and replaced both sensors. Later in the program he showed the new O2 sensor...

If a gas station states their gas has up to 10% Ethenol, anyone know what's the maximum Ethenol that could be in their 93 Octane fuel? My understanding is that Ethenol decreases the Octane, so can they put very much in their "Hi Octane" fuel?

Planning to change ATF & filter in '99 Intrigue 3.8L 153K. It's never been changed, shifts fine and no burnt smell. Considering upgrading to synthetic - what do you recommend? Is syn overkill? Is there an additive I should use prior to ATF change (cleaning)?

Preparing to replace the water pump in my '99 3800 Series II NA with 152K in an Olds Intrigue. Am I silly considering buying a Felpro gasket for $5 when a thin paper gasket comes w/ the water pump (Autozone Duralast)? What sealant do you folks use on the gasket? Both sides?

My youngest son says he gets RP for $6.00/qt shipped for his 2008 Sierrra 5.3L V8. And yes, he selects the line that meets his GM warranty.

Anyone know what the factory fill is for the 2008 350Z Coupe A/T (V6, 3.5 Liter )? Owner's manual says to leave factory fill in until the scheduled OCI (3750 I think). And last but not least - what oil would you use in this? - Scott

Just joined and am working my way through the site. What sources are there for current, honest comparisons between commercial auto oils? Especially looking to compare synthetic blends and full synthetics. Yes, saw several posts that type III and type IV oils can be marketed as "full synthetics"...