07-09-2014, 07:12 AM
0
If you go over 1,000 miles and your oil is still clean then you need to change brands/formulations. Oil has several functions. Lubrication, cooling, cushioning/gap sealing and detergent.
Lubrication is the obvious job.
Cooling becomes obvious after someone brings your attention to it.
Cushioning/gap sealing doesn't occur to most people. All engines have necessary clearance gaps. Without them they would be too tight to work! Due to this oil seals these gaps while allowing the engine to operate and cushions parts against hard impact with other components.
Detergent action removes particles from normal wear and those that are by-products of combustion. If your oil is "clean" after 1,000 miles it isn't doing its job removing and suspending particles. It should turn slightly cloudy by the 1K mile mark, deepen in color by 2k, take on a grey-ish color by 3k and turn black after that. The real indicator of time for a change is viscosity breakdown. Near change time it will start to thin out and thus lose some of its lubrication and cushioning ability.
Lubrication is the obvious job.
Cooling becomes obvious after someone brings your attention to it.
Cushioning/gap sealing doesn't occur to most people. All engines have necessary clearance gaps. Without them they would be too tight to work! Due to this oil seals these gaps while allowing the engine to operate and cushions parts against hard impact with other components.
Detergent action removes particles from normal wear and those that are by-products of combustion. If your oil is "clean" after 1,000 miles it isn't doing its job removing and suspending particles. It should turn slightly cloudy by the 1K mile mark, deepen in color by 2k, take on a grey-ish color by 3k and turn black after that. The real indicator of time for a change is viscosity breakdown. Near change time it will start to thin out and thus lose some of its lubrication and cushioning ability.
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