Some more on Amsoil vs. Royal Purple:
Amsoil beats out Royal Purple
Quote:
RUST PROTECTION 10W-40
TEST METHOD ASTM D-1748
- AMSOIL MCF - Clean - Pass
- Honda HP4 - Clean - Pass
- Mobil 1 MX4T - Clean - Pass
- Motul 300V - Clean - Pass
- Maxima Maxum 4 - Light (1-10 rust spots) - Failed
- Belray EXS - Medium (11-20 rust spots) - Failed
- Royal Purple - Heavy (21+ rust spots) - Failed
- Castrol GPS - Heavy (21+ rust spots) - Failed
- Valvoline Motorcycle - Heavy (21+ rust spots) - Failed
- Pennzoil Motorcycle - Heavy (21+ rust spots) - Failed
- Golden Spectro N4 - Heavy (21+ rust spots) - Failed
RUST PROTECTION 20W-50
- AMSOIL MCI - Clean - Pass
- Yamalube 4R - Clean - Pass
- Mobil 1 Supersyn V Twin - Clean - Pass
- Honda HP4 - Light (1-10 rust spots) - Failed
- H-D Screamin Eagle - Light (1-10 rust spots) - Failed
- BMW - Light (1-10 rust spots) - Failed
- Valvoline Motorcycle - Medium (11-20 rust spots) - Failed
- Motul 300V - Heavy (21+ rust spots) - Failed
- Castrol V Twin - Heavy (21+ rust spots) - Failed
- Belray EXS - Heavy (21+ rust spots) - Failed
- Castrol GPS - Heavy (21+ rust spots) - Failed
- Royal Purple - Heavy (21+ rust spots) - Failed
- Golden Spectrum N4 - Heavy (21+ rust spots) - Failed
SHEAR STABILITY 10W-40
TEST METHOD ASTM D-4683 (HT/HS)
- AMSOIL MCF: 4.52 cP
- Golden Spectro N4: 4.49 cP
- Motul 300V: 4.28 cP
- Maxima Maxum 4: 4.22 cP
- Mobil 1 MX4T: 4.15 cP
- Valvoline Motorcycle: 4.08 cP
- Belray EXS: 4.00 cP
- Royal Purple: 3.94 cP
- Pennzoil Motorcycle: 3.71 cP
- Castrol GPS: 3.69 cP
- Honda HP4: 3.68 cP
SHEAR STABILITY 20W-50
TEST METHOD ASTM D-4683 (HT/HS)
- AMSOIL MCI: 6.02 cP
- Mobil 1 Supersyn V-Twin: 5.94 cP
- Golden Spectro N4: 5.48 cP
- H/D Screamin Eagle: 5.45 cP
- Royal Purple: 5.34 cP
- Motul 300V: 5.29 cP
- Castrol GPS: 5.10 cP
- BMW: 5.09 cP
- Valvoline Motorcycle: 5.01 cP
- Yamalube 4R: 4.99 cP
- Castrol V-Twin: 4.91 cP
- Honda HP4: 4.55 cP
- Belray EXS: 4.39 cP
WEAR COMPARISON 10W-40
TEST METHOD ASTM D-4172 (4-BALL)
- AMSOIL MCF: 0.40 mm
- Motul 300V: 0.40 mm
- Mobil 1 MX4T: 0.40 mm
- Honda HP4: 0.60 mm
- Maxima Maxum 4: 0.60 mm
- Belray EXS: 0.60 mm
- Pennzoil Motorcycle: 0.60 mm
- Castrol GPS: 0.65 mm
- Valvoline Motorcycle: 0.70 mm
- Golden Spectro N4: 0.70 mm
- Royal Purple: 1.08 mm
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