i have a 97 civic and when i bought it it had 20 50 oil in it, there was no leaks and i thought the oil wa sway too thick. so i changed it and put mobil 1 10 30 and now oil is leaking on the front part of the engine and transmision where they meet? do u think it is becuase i have synthetic oil and i should go to like a conventional 10 40. or what. it didnt start leaking till i put the mobil 1 in it. i really dont wanna have to replace the seal between the tranny and engine

 

i know this is the last thing you wanna hear,

but from previous experience, ive seen people intentionally put heavier oil in an engine usually to silence a rod knocking sound or any etc.

but it shouldnt leaking in the first place, find the leak, and repair it, where ever it may be

 

It could be the coming from valve cover, distributor, vtec solenoid if its a b series swap. Do you have any pictures?

 

ya its deff not the cover i can see it really wet between the tranny and engine. the cover is dry

 

rear main seal or oil pan, or both.

could be an axle seal as well