SYNTHETIC OR REGULAR OIL? TELL ME - Toyota Yaris Forums

Yaris Hilton · 06-08-2010, 10:55 AM

I understood quite well, and that's what I'm arguing against. The 5K change interval is a conservative one. I'm NOT suggesting extending it. But I think it's silly to suggest that the base number analysis would suggest that the additive package of a GF-4 conventional oil would be nearly exhausted at 5K miles, but not in the synthetic. Base number analysis only indicates how much acid (mostly produced in combustion) has been neutralized by the basic additives in the oil. This kind of quasi-scientific talk really doesn't tell us that the engine is going to run better or last longer with an oil having better numbers, anyway.

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06-08-2010, 10:55 AM	#12
Yaris Hilton Half a Bubble Off Plumb Drives: 2009 Yaris Sedan Join Date: Mar 2009 Location: Bristol, Tennessee, USA Posts: 1,593	I understood quite well, and that's what I'm arguing against. The 5K change interval is a conservative one. I'm NOT suggesting extending it. But I think it's silly to suggest that the base number analysis would suggest that the additive package of a GF-4 conventional oil would be nearly exhausted at 5K miles, but not in the synthetic. Base number analysis only indicates how much acid (mostly produced in combustion) has been neutralized by the basic additives in the oil. This kind of quasi-scientific talk really doesn't tell us that the engine is going to run better or last longer with an oil having better numbers, anyway.