I have a 1992 Toyota Camry and the manual recommends a 5-30 for winter ops and a 10-30 for summer time. This is well and good until I read the oil info on this site. The basic message is that even a 0-30 oil is thicker than ideal at normal starting temperatures. A 5-30 is slightly thicker and of course a 10-30 even more so. This is all for starting temperatures. I know that once operating temperatures are reached they all warm up to the same viscosity.
Why in the world did Toyota recommend a 10-30 during summer temps if the 5-30 is still thicker than ideal? 0-30 wasn't widely available back then so I know why it isn't listed but why don't they just list the 5-30 as the only recommended oil? Why even list the 10-30, expect of course maybe for emergency ops when you can't find 5-30?
Why in the world did Toyota recommend a 10-30 during summer temps if the 5-30 is still thicker than ideal? 0-30 wasn't widely available back then so I know why it isn't listed but why don't they just list the 5-30 as the only recommended oil? Why even list the 10-30, expect of course maybe for emergency ops when you can't find 5-30?
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