About how much is it to fix a fast oil leak?

Really depends on where it is leaking from.....oil pan plug gasket would be a cheap fix, but a rear main crankshaft seal would be several hundred bucks. Best to take it to good repair shop that has had lots of exsperience in engine to repair to inspect for the source of the leak and quoat you a accurate price.

could be several issues as stated in previous post,clean eng and install oil leak dye then drive and poss find source of leak. after source is found look at the est section of this web site for info