[nautiquelfe]

I have a small amount of experience w/ a leak due to swapping over to synthetic oil. I changed oil in a 94 300zx TT and soon after I started seeing oil under the car. I spoke to some mechanics where I work and was informed that basic organic oil will leave deposits and build-up along the seals and seams of the engine walls. Once introduced it is possible for the synthetic oil to "clean" these deposits and build-up out leaving very small gaps that the synthetic oil can work its way through. Also synthetic oil can work its way through areas that convetional oils couldnt causing unseen leaks that previuosly had not shown up. This is just passed along information from very good mechanics at a michilin tire mfg. plant. NO proven facts but seemed like very good information to me. Form your own opinion.