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Mobil 1 and more on oil... - Stuart M
** Moved from the end of "Halfords oil offers" **

Since I am coming up to my next service on my 1991 Audi Coupe, I am starting to think about choice of oil. As I've had the car for a year, I obviously don't know what oil was used before I bought it. In my last service (a 20000 mile rather than a 10000 mile) I had a semi-synthetic (brand unknown) oil put in by the mechanic. Since then, I have topped up with Magantec 1040.

So, my questions are

1) What, if any benefit would I get from switching to Mobil 1?
2) If I shouldn't bother with Mobil 1, am I using the best choice of oil at the moment?
3) Should I insist that the mechanic uses a specific oil in the change?

Thanks in advance...

Stuart