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Will Higher Mileage Vehicles Leak More When Switched to Synthetic Oil?
 
Ask Your Stickiest Question. . . Or ask us something you’ve always wanted to know about using our products. We’ll sort through all the submissions and present the best questions to our automotive experts. We'll share the questions and their answers here.
Question:
Will Higher Mileage Vehicles Leak More When Switched to Synthetic Oil?
I've always heard that higher mileage vehicles will be more prone to oil leaks if one changes from regular to fully synthetic. True or not?  My '97 Expedition has 101,000 miles with regular oil. What's the best for me?
-- Patrick Poe, Norman, OK
Answer:
Mobil 1 High Mileage is formulated with seal swells that will help eliminate leakage.  We recommend you switch to Mobil 1 High Mileage for your vehicle.  If your vehicle is not leaking now, switching to synthetic will not suddenly cause it to leak.  Switching to a synthetic now may help you to maximize the life of your Expedition.  If your vehicle is leaking before you change to synthetic, it will probably continue to leak with synthetic.  However, by using Mobil 1 High Mileage it is possible that leakage could be eliminated or reduced.  It depends on what is causing the leak.
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