LeepinCat,

I agree with Double Tap that what you have heard are definitely urban
myths -- synthetic oil is a legitimate option.

However, I haven't been using  synthetic oil in my 2001 VDP, opting instead
for quality  petroleum based oil and changes every 3000 miles. I discussed
the issue with my indy mechanic when I purchased the car, and he says he
recommends whatever is called for by the vehicle manufacturer which,  in the
case of Jaguar, is premium standard motor oil.

As you have probably found, there are tons of web pages devoted to
discussion of the pros and cons. Here is another that provides those as well
as background on synthetic oil and its development.

http://www.americascarshow.com/tc/?article=The_Use_of_Synthetic_Motor_Oil_in_Aut
omobiles

Alan Strickland
Victoria, BC Canada

Definitely urban myth, go to this website and reach your own conclusions.
http://www.bobistheoilguy.com/

I've always run Castrol in my Jags.

 I know nothing of the synthetic motor oils.

Years ago, I heard bad things about "switching" to synthetics.

Perhaps these are urban myths?
Anyone have any experience with this ???
Thanks, Rj