10w30 or 5w30 1998 Jaguar XJ8

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Originally Posted By: boostedtsiawd
Another issue i noticed ever since i put chevron techron fuel system cleaner in the near empty tank and filled up with shell premium 93 gas the car dont start as fast as it use to in the cold. Is it possible the previous owner was using regular gas and now the car is confused?


Confused about what?
 
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