Quote:
Originally Posted by kathyricks
Even if what you say is true, Toyota engines of the 70’s 80’s and 90’s that were run on the API “SE, SF, SG & SH” oils available back then still had had little or no loss of cylinder compression by the 500K mile mark, hence their engines still performed like new.
Likewise in regard to the conventional vs. synthetic oil debate, even if it is true a synthetic produces better oil analysis wear numbers, the engines running conventional will still have little or no loss of cylinder compression by the 500K mile mark, hence they will still perform like new.
You say: “I use synthetic for it's better flow properties, and better protection at start up and better oil analysis wear numbers.”
And my point is: If we turned the clock back to 1976 and you bought a 1976 Toyota Corona used the factory recommended thick API “SE” 20W-40 or 20W-50 conventional oil your engine would have little or no loss of cylinder compression by the 500K mile mark despite the fact the thick 20W-40 & 20W-50 oil didn’t flow real well at start up, had only an API “SE” rating and was only conventional instead of synthetic.
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You make it sound as though most 1970's Toyotas lasted mega miles. This is not true, but this is not to fault Toyota. Most owners of most brands are not on top of proper maintenence. For those few, and yes few (a million is a few of several million cars) that made it mega miles, it was because of proper owner maintenence more then anything else.
I agree that the cr@p oil of the 1970's was still good enough to allow a Toyota engine to reach mega miles, so we agree there. But this is not to suggest that the conventional or synthetic oils of today are no better, and UOA's will bare this out.