Bacchus,
For me it's just the price. I see no reason why I couldn't use synthetic in a 1975 engine. But I can't "see" everything. Perhaps some of the new additives would do harm to seals or gaskets. Perhaps there's other things that are unknown .. to me. There's very little to gain. So I'll stick w dino as I'm assured of the results. If there was something significant to gain then I probably would. But what significant gain could there be? Very long oil change intervals have been debunked. Our engines last almost forever as it is and I don't see significant increases in economy re fuel burn ..... so what significant advantage could there be? Just significant enough to justify the price.
Name it and I'll switch.
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Eric
North Western Washington State USA
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