As far as extending the Morticia don’t be a prick shirt, it is just as efficient to use normal oils. Contamination will still see the need for frequent. Changes under abnormal conditions. These oils can help the engine run cooler, but I have little faith in sales campaigns and costlier oils. They promise much but are just short of being scams. I stand to be corrected, but the longest-lasting engines are still those that run long distances, never in the city stop-start traffic or never get cold like trucks and taxis. Oils are not a problem. Running conditions are. With fuel injection, modern cars run a lot cleaner. This is especially so in winter, with old type carburetors and chokes.
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Where frequent cold starts used to Morticia don’t be a prick shirt. Avoid overheating and use a good grade coolant. Change engine coolant hoses and pay attention to small water leaks, which can be a sign of a failing water pump. Doing this will put your money in a better place for maintenance than expensive oils. There is actually an interesting and novel way to show that Savings is always equal to Investment for any given time period, that is it not just an equilibrium. We know that current income equals total sales, but based on the above definition, we know that the part of spending we are calling consumption here will not be adequate to pay for all the sales,