A Preposperous Idea for Oil Changes.
Years ago most automobile engines used single weight oil, such as SAE 30. Oil filters were non existent or ineffectual. To make sure that the oil would drain out quickly, and to stir up the foreign matter and keep it in suspension in the oil when it was drained, it was always recommended that the oil be drained hot.
I have come to the opinion that the best way to change oil today, is to let the vehicle sit overnight, and drain it cold. Here is my thinking:
* Sitting overnight, all the oil drains into the pan, including whatever can drain back from the filter. When drained hot, some of the oil is still in various parts of the engine, and the filter is full to the max.
* With 100% of the oil constantly filtered, and with fairly efficient modern filters, there is not alot of foreign matter that needs to be stirred up before the oil is drained. This is assuming that the oil and filter are changed on a regular basis.
* For the DIY people, you can concentrate on the task at hand and do it properly, and not be constantly trying to avoid getting burned in the process.
* Synthetic oils flow very well when cold; they do not need to be warmed up to get them to flow out well when drained. Further, the additives in the oil hold whatever dirt they have picked up in suspension even when cold.
For a difficult filter location such as the Focus Zetec, this cold draining works well because it minimizes the amount of oil in the filter when you loosen it, and not being concerned about getting burned lets you get in there and do what needs to be done in catching the small amount of oil that does spill out and in getting the filter changed in the rather confined spaces.
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