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Old 10-20-2005, 09:45 AM   #29
Ralph Greene
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Join Date: Mar 2003
Location: Longwood Fl
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Re: Important Information About Mobile 1 Synthetic Motor Oil For Mach 1's

5W20 and 5W30 should flow exactly the same on start up. Both 5W. The 5W30 will have more viscosity when hot than 5W20. So don't see how it matters which you use.

However, the first principal of lubrication is to always use the lightest lubricant that will do the job (not the heaviest), so if 5W20 is the correct viscosity for my use, then 5W20 is the way to go. Oils are vastly improved over the past ferw years, and I assume the newer low viscosity oils provide the necessary film strength (for normal use).
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