Join Date: Mar 2016
Location: Lake Mary, Florida
Re: Oil Leak, new Pan or Gasket for DZ302
One way I have checked to see if a rear main seal is leaking was to remove the lower bell housing shield (automatic transmission) to see if there was oil on its bottom, as a rear main seal will drip oil and weep out onto this cover (cover is there so you could remove the torque converter bolts from the flexplate during a transmission removal). If the inside of this plate is wet with oil, the rear main seal is the culprit.
If you have a manual transmission, a rear seal (depending on the severity of its leak) will usually contaminate the clutch over time, and you will experience slippage when engaging the clutch. If the clutch is fine, then either the main seal is not the source of your leak, or it is in its "small stage" of leaking.
While I'm not always a trusting fan of "miracle" fixes, I have talked to some car owners at local shows with older cars who had rear main seal leaking issues, and they swear by Bars rear main seal fix. They stated the stuff is added to the oil, and it softens the sealing properties of the seals rubber, and the seal stopped leaking.
As stated by SolCal85, if you remove the pan to replace its gasket, be sure to place the "lip" edge of the oil pan on a 2x4, and gently tap the beveled edges of the metal at each bolt hole to flatten them. A ball peen hammer works best for this.
Never argue with an idiot; they'll only drag you down to their level, then beat you with experience.