Car and engine manufacturers give recommended oil change intervals of around or between 2,000 to 7500 miles (corresponding to 3,200 to 12,000 km) between oil changes depending upon operating conditions. There are so many variables such as engine load, short trips, speed, prolonged idling and dust that an exact recommendation that fits all vehicles, their climates and environments and driving patterns is virtually impossible.
The following conditions an be considered near ideal and if the engine is operated under them, the oil change interval can be extended to the maximum as stated by the auto , truck or Sports Utility Vehicle maker and manufacturer. These are firstly that the engine is mechanically sound. Secondly that the engine is operated for reasonably long periods of time each time it is ignited. Thirdly that the engine temperatures are maintained between 180 and 200 degrees Fahrenheit (corresponding to approximately 82 to 92 degrees Celsius.
The American Petroleum Institute states that motor oil must be changed at “regular intervals” based on the recommendation of car manufacturers. Upon checking the manual, proceed to the page where “severe service” is found. It will have two bases for changing oil, time and distance traveled. Let’s take the examples three months and 3,000 miles as examples. If you’ve already traveled more than 3,000 miles in the 2nd month, an oil drain must be done. Always follow the one that applies first in your situation. Remove 10% from the recommended mileage during summer and 20% in winter. For example, in summertime a scheduled oil change should be in order every 2,700 miles traveled. These suggested periods will ensure car owners maximum protection from oil contamination and additive depletion.
These suggestions should only be used a basis for when you should change the oil. Take it with a grain of salt. If you have an upcoming cross-country trip where you expect to travel around 7,000 miles, it is not practical to have your oil change every 2,700 miles in the summer. Granting that ideal conditions are present like well-paved roads, high speed driving and clean highways, then you can make an exemption. If luck isn’t on your side and an encounter with a bad dust storm occurs, good reason will tell you that an oil-drain must be done earlier than usual.
If you find yourself driving regularly in these conditions, you belong to the category of “Super Severe Service”. This recommendation is for owners whose cars are constantly exposed to extreme terrain and weather conditions. In this category towing is included. When you tow a trailer in the mountains, or in hot weather change oil in the soonest time possible. For the average motorist, these situations occur rarely. The best time to make that change is when the car is at operating temperature since oil doesn’t flow as well in a cool environment. Hot oil allows for the contaminants to be drained easily. All the oil should be removed from the crankcase before it is replaced. V:12
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