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Old 01-22-2013, 02:08 PM   #18
pommie john
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Joined: Apr 2008
Location: Brisvegas, Australia
Oddometer: 1,338
From Mobil's website.
The 15-50 is recommended for flat tappets, but the V-Twin 20-50 has even more ZDDP.


http://www.mobiloil.com/USA-English/...duct_Guide.pdf
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