Synthetic is superior to Conventional (Dino) oil.
But today's Conventional oil is darn good as well.
Conventional, changed with a good filter at the proper intervals, should be good enough for most types of driving and conditions.
Synthetic, if you want to go longer between change intervals, all the more important to use a good filter.
Synthetic, if you push your vehicle harder or drive in harsher conditions.
Synthetic will keep the engine cleaner (because it needs less additives that break down quickly to form deposits) and generally less wear. It may be overkill in mild driving and conditions, BUT, if you've got 160k on the motor and are going to drive even longer, then overkill on the wear reduction is likely a good thing.
Filters can be subjective, and people will argue which one is best, it starts to become fan boyish, like Ford vs Chevy. Avoid the Orange Fram filters, they are Junk. WIX is a good brand, and I don't think anyone will say its NOT a good filter, you can't go wrong using that one. BTW, the NAPA Gold (and some of the Silvers) brand filters are just rebranded WIX filters.
Antifreeze is suppose to be changed every 5yrs/100k miles, which ever comes first. The whole reason why we have this fiasco of all different types of incompatible long life antifreeze (while the original green is still the best protecting antifreeze despite if being older) is because owners never changed their antifreeze. So if you aren't going to change antifreeze, well then at least the longer life, lesser protecting antifreeze is better in the long run. Use the recommended HOAT, which the aftermarket equivalent Zerex G-05. Ford and Mercedes of the same years used the exact same antifreeze, so the Zerex G-05 is dyed the Ford Amber color. I guess Ford's using this antifreeze was the most common, that is why they went with the Ford color, it doesn't matter its just dye.
Finally, there are 2 kinds of Synthetic Oil. You can thank Castroil and their deceptive marketing, they won in court and got to call their cheaper oil "Synthetic" while still selling it at Synthetic prices. The media and consumers are too ignorant to know the difference, so the rest of the industry couldn't beat them, so they joined them.
Group II oils are refined and improved crude oil. This is conventional oil.
Group III oils are highly refined and improved crude oil, that also goes through a hydrogenation process that splits hydro-carbon molecules. This is a synthetizing process, that is why the courts agreed they could call it Synthetic.
Group IV oils are synthetized, they start as pure gases that combined in chemical reactions to produce a pure oil with uniform molecules.
Yes, most people are convinced that even Mobil1 has gone to Group III oils in their Synthetic, that only true Group IV synthetic oils you can get are the Exotics, like Royal Purple, AMSOIL, RedLine, etc....
But also don't be fooled by the Grp III originating from crude oil. The extra processes it goes through do make it a superior oil and has many of the benefits of Grp IV oils. If you use Grp III oils, your engine will be cleaner and have less wear than if you used Grp II conventional oils.
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