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5W20 vs 5W30

46K views 53 replies 32 participants last post by  Nuked 
#1 ·
Please forgive me for what I am about to say. I know the car calls for 5W30. I have had changes with Mobil 1 Synthetic Extended 5W30 at 1,500-9,000-16,000-and 23,000 miles respectively.

I accidentally bought 5W20 and changed the oil today, using about 5.5 quarts. I noticed about an hour ago that I used 5W20. Should I drain and fill with 5W30 or what?
 
#54 ·
Here is my recent sample using Mobil One 5w20. For reference, samples from left to right are as follows: Mobil One 5w20, Mobil One 0w40 and Motorcraft Synthetic 5w30. Currently running Mobil One 0w30, will have that report sometime in October.

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