Good Day,
I was on a Caddi Form and they had indicated that the Northstar engine rings need a workout every so often. The recommend to drive on the highway and place the tranny in 2nd gear accelaerate from 50mph to 70mph and then let the engine rev down back to 50mph. This needs to be repeated a few times in order to blow out any carbon deposits that may build in the upper combustion chamber.

Has anyone heard about this???

There must be less abusive ways to clean out carbon deposits. How does a tranny spinning at high RPM help clear out carbon deposits in an engine? The pistons only move as fast as you are accelerating. What you should do is find a long stretch of the QEW ( ) at night and do go WOT in your Northstar powered Bonneville.

A WOT run will clear out carbon build ups on the valves and plugs.

Shifting gears and revving the hell out of your car will hurt your expensive 4T80E.

Does anyone agree with my logic or was I blowin smoke?!

Nope, WOT baby!!

I agree with a old ole WOT run to clear out the carbon.....put just leave the trans in D or 3 and go

i agree 100%, putting it in second will do nothing but hurt your tranny.

Just open it up and let it ride out to the WOT shift

Nope... Hes right my cuzin works at a large GM dealership, has taken tons of Northstar powered Bonneville'*, Deville'*, DTS'*, Seville'* and done just that. They say they have oil comsumption problems... Thats what fixes them... Here is exactly what they do, put them in 2nd gear @ 45 - 50 mph and floor it until about 75 - 80 mph they do it 4 or 5 times and that gets rid of the oiling problems. My suggestion to all N* owners drive them more than 125miles a month. Someone said that!

i really dont see what does to solve an oil problem...not doubting you...but ya :?

I still dont think its a good idea to do that to a transmission.

The only time I have ever had oil consumption problems was an aggressive 800 km drive home a few seasons ago from the east coast. It drank about 1/2 litre of dino.

I do know that early Northstars from back in the Caddy Allante days up to the 96 Aurora had serious leaking oil problems, but that was from a bad designed oil pan not oil in the transmission.

I still dont see how revving the crap out of a transmission clears oil.