- Jun 28, 2005
- Cedar Park, TX
i totally agree on the large spreads. however, on M1 i have proof that isnt the case. Mobil 1 15w50 (red cap) raced/ridden for 200 miles in a Yamaha YZ250F. Testing done by Blackstone Labs. INSOLUBLES: .3% WATER: 0.0% ANTIFREEZE: 0.0% FUEL: < 0.5% FLASHPOINT IN \xbaF: 390 SUS VISCOSITY @ 210 \xbaF: 71.9 granted the flash is low...but the stoners are saying just 0.5% (which may or may not be true) however the 71.9 is NOT a 50wt..its not even a mid 40....actually its only 3 ticks from a 30wt!!! sheer resistant is highly application specific. and until tested in that application... really isnt known.
Originally Posted by Cujet
As a general rule, wide multigrade oils like 5W-50 employ viscosity index improvers to achieve the qualities of each oil at the rated temperatures. Motorcyclists with shared sump eng/trans, who use 5W-50, 10W-60 (and similar) find that they shear very rapidly. Often lasting less than 1000 miles. M1 15W-50 is very shear resistant, by design with a minimum HTHS of 4.5 (although tests at 5.1) .
Originally Posted by nautoncall
A_Harman, that Redline 15w50 sounds perfect. Do you think its better than 5w50?