synthetic oil in an old motor?

[USMC302]

Here is a story from a Mustanger from this very board.....

[QUOTE=88COBRA]Hey Guys, just some info and a story for you.

My car is a 1988 5.0 with 145,000KM. No oil leaks.

Everyone tells me to switch to Synthetic Fluid, so I try it. I get some Mobile 1 Synthetic 10W 30. I put it in and noticed an improvement right away. I drove it for a week, and I noticed leaks. I thought, nothing serious. BUT it was starting to go bad, Oil Pan, front seal, rear main seal, valve covers, ect.... It seems like every gasket went bad at the same time.

Now I am screwed! I have to pull the motor to get all the damn seals out. This is not a bad thing, but now I have to save every $$$ to do this. If I am going to pull it, I am going to do it right, 306 (maybe) valve job, cam, ect...

I have searched all over the net, and everywhere I go I read that Synthetic is the best, and will actually help stop oil leaks. Well it did the opposite for me. Luckily it is almost time for storage, which I will be doing this weekend.