一位國外網友，自行購入專業的油膜強度測試機台，測試了44款機油，
每種機油做數次測試，並超越ASTM D 2782規範(室溫測試)，
他把所有機油加熱到110度模擬實際的引擎溫度，
幾個重要的結論:
* 最新API規範的低鋅/低磷 添加機油，不管是不是全合成，表現非常傑出，
超越傳統 高鋅/高磷 號稱競技版機油
*低價的合成油表現比預期來的要好
*號數越大，油膜強度並不會比較好
機油的好壞不只看這項，還有清潔性，耐久性，流動性等等，勿以此項測試下定論，
作者也說了，沒有不好的油，意思是都能提供足夠的保護給一般使用者，
此測試僅供參考。
http://speedtalk.com/forum/viewtopic.php?t=30483
1. 5W30 Pennzoil Ultra, API SM = 115,612 psi
(No API SN available for this test)
2. 10W30 Lucas Racing Only = 106,505 psi
3. 5W30 Mobil 1, API SN = 105,875 psi
4. 0W30 Amsoil Signature Series 25,000 miles, API SN = 105,008 psi
5. 10W30 Valvoline NSL (Not Street Legal) Conventional Racing Oil = 103,846 psi
6. 5W50 Motorcraft, API SN = 103,517 psi
7. 10W30 Valvoline VR1 Conventional Racing Oil (silver bottle) = 103,505 psi
8. 10W30 Valvoline VR1 Synthetic Racing Oil, API SL (black bottle) = 101,139 psi
9. 5W30 Chevron Supreme conventional, API SN = 100,011 psi
10. 5W20 Castrol Edge with Titanium, API SN = 99,983 psi
11. 20W50 Castrol GTX conventional, API SN = 96,514 psi
12. 30 wt Red Line Race Oil = 96,470 psi
13. 0W20 Mobil 1 Advanced Fuel Economy, API SN = 96,364 psi
14. 5W30 Quaker State Ultimate Durability, API SN = 95,920 psi
15. 5W30 Castrol Edge with Titanium, API SN = 95,717 psi
16. 10W30 Joe Gibbs XP3 Racing Oil = 95,543 psi
17. 5W20 Castrol GTX conventional, API SN = 95,543 psi
18. 5W30 Castrol GTX conventional, API SN = 95,392 psi
19. 10W30 Amsoil Z-Rod Oil = 95,360 psi
20. 5W30 Valvoline SynPower, API SN = 94,942 psi
21. 5W30 Valvoline Premium Conventional, API SN = 94,744 psi
22. 5W20 Mobil 1, API SN = 94,663 psi
23. 5W20 Valvoline SynPower, API SN = 94,460 psi
24. 5W30 Lucas conventional, API SN = 92,073 psi
25. 5W30 O'Reilly (house brand) conventional, API SN = 91,433 psi
26. 5W30 Red Line, API SN = 91,028 psi
27. 5W20 Royal Purple API SN = 90,434 psi
28. 5W20 Valvoline Premium Conventional, API SN = 90,144 psi
29. 30 wt Castrol Heavy Duty conventional, API SM = 88,089
30. 10W30 Joe Gibbs HR4 Hotrod Oil = 86,270 psi
31. 5W20 Pennzoil Ultra, API SM = 86,034 psi
(No API SN available at test time)
32. 5W30 Royal Purple API SN = 84,009 psi
33. 20W50 Royal Purple API SN = 83,487 psi
34. 5W30 Mobil 1 Extended Performance 15,000 mile, API SN = 83,263 psi
35. 0W20 Castrol Edge with Titanium, API SN = 82,867 psi
36. 5W30 Royal Purple XPR (Extreme Performance Racing) = 74,860 psi
37. Brad Penn, Penn Grade 1 Nitro 70 Racing Oil (semi-synthetic) = 72,003 psi
38. 0W30 Brad Penn, Penn Grade 1 (semi-synthetic) = 71,377 psi
39. 10W30 Brad Penn, Penn Grade 1 (semi-synthetic) = 71,206 psi
40. 15W50 Mobil 1, API SN = 70,235 psi
41. 5W30 Motorcraft, API SN = 68,782 psi
42. 10W30 Royal Purple HPS (High Performance Street) = 66,211 psi
43. 10W40 Valvoline 4 Stroke Motorcycle Oil conventional, API SJ = 65,553 psi
44. Royal Purple 10W30 Break-In Oil conventional = 62,931 psi
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