Either 5.5 or 6. It depends on how long you wait for the oil to settle before you check it. When I worked at a Chevy dealer some guys would start up a car/truck. Let it run for 20 seconds, then immediately check the oil level. This is incorrect. You need to let it sit for at least 5 min. to let the oil in the valvetrain settle to the oil pan. I learned this the hard way after leaving GM and going to work for John Deere. A 12.5L diesel engine will hold 1-2 gallons of oil in the upper end for 2-5 min before it drains down. Now that is a little over full!!
5.5 is what my manual says but I run 6 because of all the bearing failures due to apparent oil starvation. I was reading some posts last week about guys running 7 who road race/A/X thier cars. That seems excessive to me me but maybe 6.5 would be fine and not have the crank kick up oil and aereoate it. That would seem like the biggest issue to me????
6 would be ok, but I'd think 7 would be a bit much. I put to much oil in a old truck I had and it smoked very bad. I'll try 5.5, let it sit for 20 min. If I need more I'll put in the half quart I'll have left. Thanks for the info guys. I have alot to learn about the great LS-1!!!
__________________ 2000 Trans am: Slp lid/ Fast92 Intake/Nw92 Tb/ SE 1 7/8 headers/ Tsp ory/ Slp Lm-2 Cat back/ Yank SS 3600
2011 Nissan Maxima: DD
1999 Z28: H/C/I 4k stall Sold
You more oil you run the more power you will lose with oil drag on the crank. Yes minor, but just put what it is called out from the manufacture. The dipstick is also not calibrated. So with the proper size oil filter... it calls for 5.5 quarts.
__________________ 98 Z28 34K on the odometer, A4 , SLP LID, Magnaflow cat back, TB bypass, P&P TB, Vinci / Crane Tuner, FTA, Strano lowering springs, BMR LCA's, panhard and relocation brackets, and 3.42 gears.