I use Mobil 1
fully synthetic in my cars and trucks and no problems..your mechanic is nuts..
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2000 Ford 7.3 Powerstroke 4x4
2006 Mazda Tribute
1983 Black 300 D (donated to charity)
1993 Teal 300 D (160K) Sold
"I love the smell of burnt diesel fuel in the morning, it smells like ....VICTORY"
Semper Fidelis
USMC 1973-1976
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