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My 1996 2.5l 10v with 150000miles has just been changed over to Mobil 1.
My observations:-
There is extra power (or less resistance)....appears to have about 10% extra power based on 40mph in 4th gear...therefore slightly more fuel efficient
The bad news is the cost of Mobil 1 ...lots of people use cheaper fully synthetics and change them more often
Seals can start leaking...some people add a thicker oil to help negate this.
Mine used to burn no semi-syn oil, but now burns a little fully syn, not much but enough to need topping up once a month a little.
It should be fully comaptible, but depends what exact oil you have in there at the moment.
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