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Someone replied me with the following when I was question syn vs dino..what do you all think?
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Advantages of synthetic oil and why they don't work for your situation.
1. Oxidative stability of synthetic base oil can endure high temperatures such as in Turbo Chargers as well as extend drain intervals.
(your oil will still be water logged with the acids forming as the water reacts with combustion byproducts, you have no turbo and extended drains with acid forming in the crankcase is not recommended.
2 Extreme low temperature flow is an advantage of synthetics. I use it in my arctic work truck. I often have temperatures of -30 to -40f where i work and this is the only ways the trucks can start.
(Your winter is not cold enough to see any tangible benefit in start up protection between the conventional and synthetic)
3. Stronger additive package for extended drains.
Yes the TBN is higher, but unless you run it long enough each time you start the caravan you are leaving moisture in the crankcase which is going to attack any oil just as fast.
If all your trips were 10 or more miles I would say you could go synthetic but extend the drain. However since the duty cycle is actually severe duty because of the soccer mom routine With the required short OCI's I see no advantage at all, in protection, performance or otherwise in running a synthetic motor oil. If you like to give money away I can provide you with my Paypal, I actually gave you something worthwhile.