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Why can't You use Synthetic oil in old engines??
Is it really true you can't use Synthetic oil in old Engines? What happens if you do?
I've been running Fully Synthetic Mobil 1 oil in this old Willys jeep engine for the past 500 miles, lets see how it has done!
Blog with the oil data
https://540ratblog.wordpress.com
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/ greendot319
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