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No it is not bad -just more expensive for no real saving. The engine oil should be changed every 5.000 miles as the purpose of the oil is to provide lubrication, hold impurities in suspension, neutralise the acids formed during combustion and give the oil a tension ability ( won't squeeze out from under the bearings under load ). I get all these things plus a heavy detergent action in the oil when I use 30w50 diesel oil plus I get longer engine life. Cheaper than synthetic oils too.
I have used the standard 10W-30 oil in all my vehicles throughout all seasons, and I personally prefer Quaker or Pennzoil. Buy a middle to top of the line brand. If you happen to have extreme temperature/weather variations where you live, you might want to consider a different weight of oil during those extremes. Most garage mechanics will have their opinion on what weight and brand to use under what conditions and they do a good job of explaining when different types of oil should be used. A Google search for something like "motor oil weight differences" will give you some articles to consider. Try this link: http://www.upmpg.com/tech_articles/motoroil_viscosity/
Yes. 10-w30 will act like a 10 weight oil when cold and a 30 weight oil when hot. 10-w30 will act like ten weight when cold, but like (thicker) 40 weight oil when hot. Your profile only says Cadillac and doesn't say model or year, but most cars since the early- mid 80's use 5-w30. Always use the oil weight recommended in your owners manual. If you are unsure call the dealer and they will tell you what is right for your car.
5w 30 or 10w 30 during the winter. After an oil change... check your oil after 200-300 miles of use. Is the level the same? If so your weight is fine. If it drops, it's to light of an oil and your engine is now "drinking it" like fuel, move to a heavier weight. As far as Changing between winter and summer. Changing Oil weights is not bad for your motor so if the winter you go with 5w 30 and it works, great, shoot for the same during the summer. If it seems to "drink it" during the summer using this weight, go up to the next (10w 30)
That being said. Changing from natural oil, to synthetic, back to naturual , or vice versa... swapping back and forth between these KINDS of oil has been known to cause damage. so whatever weight you decide on, stick with one "type", natural or synthetic.
The motor oil from the factory is motocraft synthetic blend 5w-30 for normal conditions and motocraft synthetic blend 5w-20 for cold environments. But any synthetic blend or full synthetic of equal weight will do just fine and you will require 5 quarts of oil. DO NOT USE A THICKER WEIGHT OIL, OIL ADDITIVES OR NON SYNTHETIC. Thicker oil like 10w-30, 10w-40, 20w-50 will not be thin enough to lubericate the tighter clearences of the motor and coventional oil breaks down faster than a synthetic blend or synthetic. And be sure to change the oil every 5,000 miles
basically those numbers mean it is 20 weight oil when it is cold and 50 weight when it is hot. it should be fine for that motor tho i would recommend 10w30. with the heavier oil you should find the motor quieter tho in extreme cold temperature it will be harder to turn over.
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