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Will a Highly Modified Car Benefit More from Mobil 1 Extended Performance 10W-30 or Mobil 1 15W-50?
 
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Question:
Will a Highly Modified Car Benefit More from Mobil 1 Extended Performance 10W-30 or Mobil 1 15W-50?
2004 Evo, 2L turbo, 48,000 miles, original owner. I have been running Mobil 1 10W-30 all the way up to 40,000 miles.  Then I switched to Mobil 1 Extended Performance 10W-30 just for the added protection. I change the oil every 2500 miles or less (28 changes so far) because I drive the car hard with a water/methanol assisted 30 psi boost. My question is even though the owners and FS manual strictly direct to use Mobil1 10W-30 for typical climate, and since my car is highly modified and voided of all warranty whatsoever, would I be better off trying your new Mobil 1 15W-50 synthetic product? I drive the car in a very hot and humid climate and get a lifter tick at times. Am I wasting money using the Extended Performance product since I change my oil every 2000 - 2500 miles, or am I getting some benefit with the Extended Performance over the Mobil 1 equivalent at these intervals too? Remember, you can cut through any of the manufacturer's warranty bull you feel you should respect since my warranty is long gone. Thanks!
-- Steve Dalpiaz, Charleston, SC
Answer:
For your high performance application, we would recommend you use Mobil 1 15W-50. The higher viscosity will provide better protection in conjunction with higher levels of anti-wear potentially needed with the turbo boost and severe operation and temperature. With your short change intervals, the product will still have adequate performance reserve remaining at oil drain. We need to mention that switching oils will cause you to give up some fuel economy but we're assuming this may not be your highest priority. You may also want to switch back in the colder months to the 10W-30 for better low temperature flow and protection.
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