Not sure this is true now.
It is my understanding that Mobil 1 synthetic oils have "seal conditioners" with the sole purpose of preventing leaks. I have been using mobile 1 0w40 for over 16,000 miles now and have seen no leaks.
Originally Posted by
The Melmaan
Micah,
I was told by a mechanic who specializes in Bimmers that not to use synthetic oil due to its ability to eat up the seals on older cars. This is true (I think)with my cousin who have a 94 525i. He started using synthetic oil several months back and now his car has numerous oil leaks. We can figure out at first if he over filled the tank or what, until we came across this mechanic who has a 535i and he learned the hard way. Now, whether this is a coincidence or not, we don't know.
On my car, just worried about wearing down the lifters faster than normal.
Thank,
The Melmaan
Thanks,
1995 525i Auto, M50TU 2.5L, EAT chip, 1/95 build, USA, 205/65/15 tires, ASC+T, HID, lumbar, EC Mirror, BMW Alpine 5 radio with BMW-Pioneer CD Changer, abt 236k miles, Oxford Green/Parchment