Synthetic oils maintain a fairly constant viscosity through out the operation heat range , where as mineral oils change viscosity as the engine gets hotter ( synthetic oils 20 w and minerals 15w-40 )
It could be a manufacturer requirement to maintain warranty but it is generally accepted that mineral oils and synthetic oils have small differences in the life of an engine
Talk with an oil manufacturer such as castrol, shell etc and with your service dealer to get a better understanding of the requirement
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Year:
1988
Make:
Toyota
Model:
4Runner
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