Oil, Synthetic or regular?
 

I just bought a 2002 S80 2.9 and don't know what kind of oil they used? I did ask but they had no idea and nothing marked down in the Owner's manual notes. My question is would it hurt if I just started using synthetic 5w30? I use it in my Mercedes and Hummer H2 as well.

Everything I own runs on synthetic ....make the switch and never go back.

Thanks John, That was my thought. Man you sure own allot of Volvo's I see.

i had switched to synthetic on two cars, both around 100k miles, having run on mineral before. both started to consume some oil without leaks, better keep checking the level. also, the filter got quite quickly clogged on both, i had it changed sooner to be safe.

Will keep a close watch, Thanks for the advice.