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How can people call mobil 1 or royal purple crap? Its not like they are providing any type of evidence to back it up. Just because you read it on the internet doesn't always mean its true.
I use mobil 1 engine oil and royal purple for the trans and will use it when i change the diff oil.
Mobil1 is great. I used it in my last mustang and it was running like new at 130,000 miles. Others have taken their engine apart after using Mobil1 for over 100,000 miles and there was no wear at all.