What oil i need for an audi A6 1.9 tdi with 100.000 miles on.I HAVE USE CASTROL MAGNATEC 10W 40 SO FAR BUT MY MECANIC TOLD ME NOT TO USE IT ANYMORE IT IS NOT SO GOOD WHAT SHOULD I USE?

I've come to love the 100% synthetic oil I put in my 1998 Audi A6 Quattro. My fuel range increased, by what % I'm not sure but it's defenitely better. All I've read about synthetics compared to conventionals solves the many questions I've had. I used to run only conventionals in my nCadilac Northstar engines till one day it blew up. I homestly believe the engine would haave never had been dameged if I wiuld have had 100% synthrtics in ig.

Wal-Mart Super Tech 5W30 is the best full synthetic oil for the money. They have recently (18 months ago) raised the price to abut 17.00 per FIVE quart container. Up from about 14.00 - but even with the price increase, it is a great oil, best buy option and does what all synthetic oils do, last longer, remain slicker and keep your engine cleaner.

One of the best new synthetics out there today is "Royal Purple" for oil and automatic transmission fluid.
Try it,I use it and it does give better boost you can feel and see for your self.
I use it cause it is great and I have and old skool muscle car that used to be a drag race car with a brand new engine and if it does good with that it will probably do great for your precision Audi!!!
I think the best part is that you only have to change the oil with that type of top of the line oil every 7 months approx.