I also pulled this off of Bobistheoilguy. Blue is what I run (happens to have the highest film strength), yellow and green are what I see the most of on this forum and the results are kind of crazy. I have also runt he amsoil signature and that oil did great in my blackstone lab report after extended use.
This was a film strength test run by 540 RAT over at Speedtalk.com. He used an oil load carrying capacity/film strength” tester to test 44 motor oils. The psi each oil supported was calculated, yielding the value of its load carrying capacity/film strength.All oils were tested at 230 degrees F.I have excerpted below but here is the link to the full write-up:
Film Strength Test
Regular Mobil 1 5W-30 had a film strength of 105,875 psi while Mobil 1 5W-30 EP only had a film strength of 83,263 psi. Anyone find that surprising?
Here are the results he came up with:1.
5W30 Pennzoil Ultra, API SM = 115,612 psi(No API SN available for this test)2. 10W30 Lucas Racing Only = 106,505 psi3. *** 5W30 Mobil 1, API SN = 105,875 psi4.
0W30 Amsoil Signature Series 25,000 miles, API SN = 105,008 psi5. 10W30 Valvoline NSL (Not Street Legal) Conventional Racing Oil = 103,846 psi6. 5W50 Motorcraft, API SN = 103,517 psi7. 10W30 Valvoline VR1 Conventional Racing Oil (silver bottle) = 103,505 psi8. 10W30 Valvoline VR1 Synthetic Racing Oil, API SL (black bottle) = 101,139 psi9. 5W30 Chevron Supreme conventional, API SN = 100,011 psi10. 5W20 Castrol Edge with Titanium, API SN = 99,983 psi11. 20W50 Castrol GTX conventional, API SN = 96,514 psi12.
30 wt Red Line Race Oil = 96,470 psi13. 0W20 Mobil 1 Advanced Fuel Economy, API SN = 96,364 psi14. 5W30 Quaker State Ultimate Durability, API SN = 95,920 psi15. 5W30 Castrol Edge with Titanium, API SN = 95,717 psi16. 10W30 Joe Gibbs XP3 Racing Oil = 95,543 psi17. 5W20 Castrol GTX conventional, API SN = 95,543 psi18. 5W30 Castrol GTX conventional, API SN = 95,392 psi19. 10W30 Amsoil Z-Rod Oil = 95,360 psi20.
5W30 Valvoline SynPower, API SN = 94,942 psi21. 5W30 Valvoline Premium Conventional, API SN = 94,744 psi22. 5W20 Mobil 1, API SN = 94,663 psi23.
5W20 Valvoline SynPower, API SN = 94,460 psi24. 5W30 Lucas conventional, API SN = 92,073 psi25. 5W30 O'Reilly (house brand) conventional, API SN = 91,433 psi26.
5W30 Red Line, API SN = 91,028 psi27. 5W20 Royal Purple API SN = 90,434 psi28. 5W20 Valvoline Premium Conventional, API SN = 90,144 psi29. 30 wt Castrol Heavy Duty conventional, API SM = 88,08930. 10W30 Joe Gibbs HR4 Hotrod Oil = 86,270 psi31.
5W20 Pennzoil Ultra, API SM = 86,034 psi(No API SN available at test time)32.
5W30 Royal Purple API SN = 84,009 psi33. 20W50 Royal Purple API SN = 83,487 psi34. *** 5W30 Mobil 1 Extended Performance 15,000 mile, API SN = 83,263 psi35. 0W20 Castrol Edge with Titanium, API SN = 82,867 psi36.
5W30 Royal Purple XPR (Extreme Performance Racing) = 74,860 psi37. Brad Penn, Penn Grade 1 Nitro 70 Racing Oil (semi-synthetic) = 72,003 psi38. 0W30 Brad Penn, Penn Grade 1 (semi-synthetic) = 71,377 psi39. 10W30 Brad Penn, Penn Grade 1 (semi-synthetic) = 71,206 psi40. 15W50 Mobil 1, API SN = 70,235 psi41. 5W30 Motorcraft, API SN = 68,782 psi42.
10W30 Royal Purple HPS (High Performance Street) = 66,211 psi43. 10W40 Valvoline 4 Stroke Motorcycle Oil conventional, API SJ = 65,553 psi44. Royal Purple 10W30 Break-In Oil conventional = 62,931 psi