lizzyfan

I know for a fact that most 96-04 run 6qt so I'm sure it's close to that on the s197 platform

Unleashedbeast

The AMSOIL application guide also says 5 quarts for the 4.0L V6, but if it's only 1/8" just leave it.

2005Redfire6

I mean would I feel it if its wayyy too much? What can happen with too much oil?

Unleashedbeast

other than reduced engine efficiency from the crank whipping the top layer of the oil (if one quart would even raise it that high in the 4.0L)....nothing

Some say the crank can "whip" the oil and create air bubbles that can accumulate in an oil pump and cause problems. I have never seen this "rumor" take place, even in cars that were 2-3 quarts over full.

On road auto X'ers have been known to add the extra quart as to not starve the engine for oil during hard cornering, braking, acceleration, etc.

Honestly, I wouldn't worry about it.

2005Redfire6

Alright cool, I didn't think it would be that big of a deal! With the new Pennzoil its just that much more factory clean engine cleaning! .

lizzyfan

Just realized you have a sixxer

Unleashedbeast

running that extra quart of oil can also increase the oils drain interval.

2005Redfire6

Yep.. I was wondering why you were talking about 6 qts...

Blackened04

I just recently switched from Mobil 1 full synth 5w20 to the Penzoil Ultra, and my engine seems to run a bit quieter. The Ultra probably doesn't make a very big difference, but Mobil 1 seems to have gone down hill so it was time for a change. Seems like kind of a waste to run an expensive synthetic in a 4.0l sixxer. When I had the 3.8l I just ran the partial synthetic Castrol oil and the engine never missed a beat the entire time I owned it.

Soldier GT

good info to know guys..