Oil is a topic for different opinions.
One of Swedens most prominent enginebuilders (dragracing and street) says that syntetic oils are only for modern engines where the tolerances are more tight than on old engines.
In older ones like our musclecars big and small blocks the tolerances are wider and there a syntethic oil might not work properly. In some cases you wouldn't even reach the correct oilpressure.
Even when the syntethic oils are more expensive they are not by that better. For older enginetypes like a '69 bigblock like mine I run with basic engine oil, not necessarily expensive.
The more expensive oil also has additives that don't do any good in a engine like we run, if we change the oil very often. The additives are mostly there to make the oil last longer.
Just my thoughts...
Jan
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