I have a 98 mustang with about 67,000 miles. If I was to put synthetic oil into it would it cause any serious problems. I have heard that it causes leaks because of its effects on gaskets. What do you recommend. Is synthetic that much better?</P>

 

I started putting synthetic in my 93 after about 100,000 miles and I have never had any problems with it (unless you consider my starter and alternator going out in the same week) but that has nothing to do with oil.</P>


Seriously, I'v been running synth for over 90,000 miles and as far as I can tell it has been nothing but an advantage.</P>


Put a K&amp;N filtercharger on it with Castrol Syntec and you will feel the difference.</P>

 

I also have 98 v6 mustang and I use synthetic without any problems. I was told however, not to go back and forth on oil like one oil change use synthetic and the next oil change use conventional oil. You should be fine. I could tell a difference in engine start up and cooler engine temperatures.

 

The sooner you change the better, unless your burning oil lol