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Place a clean flattened cardboard under your car and see if it's leaking out. If it's not dripping oil, check your radiator for the presence of oil using a dye test kit available at NAPA. If there is a leak coming from under your car, try to determine from where it's dripping. Most common is an oil filter that hasn't been tightened properly or leaking oil sump bolt. A 1/4 turn on the oil filter should stop the leak, if its the sump... a new screw washer for the sump bolt will usually cure that. Check around the sump mounting bolts, if a fresh leak is evident, you will need a new sump gasket, don't try to tighten the existing bolts as it make leak worse! Tighten to torque specs. Otherwise, you are burning it up... exhaust smoke should be dark instead of light gray. White smoke indicates a blown head gasket and the oil is getting into the engine.
You should try your oil pan gasket or your timing chain gasket cause that I'm taking mine to the shop to see what it is exactly buy I don't have the time to look at the leak exactly ill let you know what it is exactly though ok.
It may be leaking from the transmission pan gasket or either of the transaxle seals. If it's leaking from the middle front of the transmission, it could be the front pump seal, if it's that, you'll have to remove the transmission to replace that seal. They others can be done with the transmission in the car.
On the DOHC: The Spark Plug Tube Seals (Washers) on the Valve Cover has developed a leak.
Install new seals.
Remove the Valve Cover to Install the Seals.
If the Valve Cover Gasket have not been replaced recently, go ahead and replace them as well, making sure you clean thoroughly BOTH surfaces before installing any new Seal Washers and Gasket.
Let me me know if this helped, or if you have additional information or questions. Feel Free to contact me on FixYa.com!
ps...I'm replacing (for free!) the Valve Cover Gaskets today on a 1994 Nissan Maxima. Looks like we both will have fun!
If you need the Valve Cover Torque Sequence / Specs let me know on the Comment Section of this Post.
try warming up the engine a little then re-tightening the bolts,if that doesnt work,mark where its leaking and pull the pan back off and apply sealant to that area a little heavier than the rest of the gasket surface,dont use too much on a new gasket,just a really thin coat...USE "ULTRA BLUE" sealant,NOT blue or black RTV silicone,silicone wears out and it can leak after a while..Allow the ultra blue sealant to dry for about 30 minutes before re-assembling it,and clean off all oil from the gasket before applying the sealant,its ok to apply it to both sides of the gasket,and add a glob to all 4 corners where the gasket meets with rubber seals around the crankshaft,but put those globs on right before you put the pan back in place,the sealant has to be wet to squish in enough..i hope this helps