I am about to have my rear main seal, cam seal (?) and oil pan gasket changed soon. Due to a leak coming from an unknown source this will be done as a precaution and a "health" checkup on the lower end of the engine. I am know also suspecting a front seal leak as well. For those of yall that have changed the rear or front seal, how many miles did you have on your truck prior to this maintenance? I currently have 284,XXX miles on my truck.