The specifications were written for cars being driven as regular transportation, and when they were new. Neither one of those conditions is usually the case today. Cars that are seldom driven require much different maintenance than those in regular use. One of the differences is more frequent oil changes, which is why I think synthetic oil is a waste of money in an old car. Crankcase ventilation was not what it is today. This means that more impurities linger around and mix with the oil, especially on cars driven very little. Leaving any oil in the engine for an extended period is like pouring a handful of dirt down the filler before starting the engine. This is much worse for cars showing wear with some blow by. Moisture and blow by gases combine with oil to make acid. This ruins polished metal and bearing surfaces. Since one of the primary benefits of synthetics is longevity, that benefit is cancelled out on cars that don't get driven enough.
Just curious, I wonder if anybody here could take a look at their owners manual and let me know what Chrysler
corp recommended when it came to the type of oil to put in the car.. brand and which type. I don't know if they ever changed, but specifically '64 through '66.
I'd just like to know out of curiosity, and to see if that particular brand also sells a lead additive, to see how much it would cost. I'm somewhat of a purist so I'd probably use whatever Chrysler wanted the buyer to use.
And, I'm sure synthetic is not REQUIRED, but would that be better oil to use? Any advantage? I know it's designed for sports cars, but if it would run smoother and/or make the engine last longer etc, I'd use it for sure.
Thanks
-Matt
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