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Ok guys, I was running Valvoline Premium Blue Extreme in my engine before the engine swap into the new body.. I just drained the whole thing for several days on the engine hoist, then refilled with Mobil 1.
Here are my sample results after 4200 miles. (Not changed this time. Just changed Toilet paper roll and added 1 quart oil....)
First & Second Sample: No bypass, Shell Rotella T Synthetic 5w40
Third Sample: No Bypass, Valvoline Premium Blue Extreme Synthetic 5w40
This Sample: Bypass, Mobil 1 synthetic 5w40
I might add, my oil stayed clearish for almost 700 miles before turning dark with the bypass filter........
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-Matt
EPA Section 609 Certified MVAC Technician
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Oil Burner Kartel Member #10
Ahh the smell of Diesel Fuel, it's like coffee in the morning!
My Car:
1982 300SD Turbo Diesel (231,500 miles!) RIP 
1984 300SD Turbo Diesel Custom (235,500 mi on driveline.) - On Road!! 
www.icsrepair.com
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