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Will Switching to Mobil 1 High Mileage Decrease Burn-off in a Performance Car?
 
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Question:
Will Switching to Mobil 1 High Mileage Decrease Burn-off in a Performance Car?
I have a '95 Saturn SL2 that I Autocross with 200,000 miles on it. Since I've had the car it's burned about 2-3 quarts every 3,000 miles, I use Rotella syn 5w-40. Recently I have started to burn more oil, a quart every 500-700 miles or so, but there isn't any noticeable smoke unless I'm at WOT (wide open throttle) and then it's mostly black from how rich these cars run. Do you think I would see any decrease in burn-off using Mobil 1 High Mileage 10w-40? I tried regular Mobil 1 10W-30 in the past with a steep increase in burn-off, probably from the switch to a lighter oil. If I don't gain anything from the high mileage oil would it be ok to try 15W-50 on an engine designed to use a 30 weight? I don't have any internal engine mods, but my compression is above the average. Also performance is a concern; I won my regional championship last year and was thinking of doing a national event this year.
-- John Morgan, Orlando, FL
Answer:
The best way to improve oil burn-off is to switch to a higher viscosity grade. Either Mobil 1 15W-50 or Mobil 1 High Mileage 10W-40 would be the right way to go. If you think some of your oil loss may be due to leakage and not burn-off, then Mobil 1 High Mileage may help to re-condition leaking seals, otherwise you should try the Mobil 1 15W-50. If this works, then you may want to step down to the 10W-40 and see how it does. This will help to restore some power you may lose by going to higher viscosity.
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