Mobil 1 Tri-Syn

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4,660
Location
The Garden State
This is not a scientific answer but I did and had no problems or funny looking oil, even at draining @ 5,000 mi and going through a nasty winter. Like you I had 2 quarts of 5w-30 Tri-syn left so I mixed it with 2.5 quarts of 5W-30 Supersyn. Now it's just pure Supersyn in there. [Big Grin] Whimsey
 
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