10W-30 Mobil. The M103 is a sturdy well built engine. If the rods aren't rapping and the pistons ain't slapping then motor on and don't worry..
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Jeff Lawrence
1989 300e
2000 Dodge Grand Caravan SE
No matter what you fix, there will always be something else to fix..
"Warranty" is just another way of postponing the inevitable.
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