Need your "expert" advice
#1
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I took my car in yesterday for the 20K oil change. I had 9 quarts M1 0W-40 in the trunk. When I got home there was still 9 quarts in the trunk. Tech forgot and used "regular" oil they said. It has had M1 in since the 5K change (at all of your recommendations). They said I can come back in and they will change it. I hate to waste 9 quarts of oil (yes theirs) but I don't think it is good to change back to regular oil after 10K of synthetic. Any comments?? Thanks.
#3
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I don't think it's going to hurt anything, but I would make them switch it back, especially if you are planning on going 10k between changes.
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