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Starfish, a gray bottle could also be Mobil1. Which is now sold in full synthetic and two partial synthetics, just to confuse the consumer.
The pros/cons of synthetic oils seem to break down into:
1-It's a better product because it is "built" to a higher spec.
2-Doesn't coke (turn to tar) until much higher temperatures.
3-Usually has more/better additives in it.
4-Oil samples confirm it isn't breaking down as quickly.
And on the "down" side, yes, it does cost a bit more (over $6/qt now), but mainly, it can slip past worn seals in older engines, so they may consume more of it. And as the seals/rings get better lubrication, some folks swear it can create leaks. There were also specific problems related to combustion by-products in turbo-charged aircraft engines that should mean nothing to boat/truck/car users.
But in the last 20 years, even "conventional" oils have gotten much better. Unless your engine is sucking oil, I'd go synthetic. If for no other reason than because it holds up to heat better, and there's always too much tar in old engines run on conventional oils.
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