Question on Oil changes

NickTheGreat

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The guys who sell you oil or you pay to change it recommend every 3 months or 3000 miles. The guys who design the engine say double or triple it.

Our GM vehicles have a oil life monitor, and I go off it. With my commute/driving habits its about every 8 or 9 months . . . :confused:
 
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Gorm

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Eventually, the oil filter media on the inside will wear out. Usually, the cheaper the filter, the quicker the media will degrade due to usage. I have always used more expensive filters, (Mobil 1, purlator...etc) and go about 6000k miles between changes.

However, in this case, I would just keep track of the oil level and change the filter once a year.
 
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derpyherky

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Eventually, the oil filter media on the inside will wear out. Usually, the cheaper the filter, the quicker the media will degrade due to usage. I have always used more expensive filters, (Mobil 1, purlator...etc) and go about 6000k miles between changes.

However, in this case, I would just keep track of the oil level and change the filter once a year.

6,000,000 miles between oil changes? Holy crap, you're a road warrier.
 

mj4cy

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I would honestly take it out and put some miles on it every other week or so. I'd have to look it up again, but only driving a mile at a time can potentially cause engine damage because it isn't getting all the way up to operating temperature.

My Grandpa always used to tell me in winter to let it run a couple minutes before going anywhere so the engine can get warmed up and work optimally.
 

VeloClone

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My Grandpa always used to tell me in winter to let it run a couple minutes before going anywhere so the engine can get warmed up and work optimally.
Yes, it is best to get the fluids at least partially up to temperature before working the engine hard. They say that about 90 seconds is about all the engine needs even in fairly cold temperatures. Anything beyond that is strictly for driver/passenger comfort and otherwise a waste of fuel.
 
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Gorm

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Yes, it is best to get the fluids at least partially up to temperature before working the engine hard. They say that about 90 seconds is about all the engine needs even in fairly cold temperatures. Anything beyond that is strictly for driver/passenger comfort and otherwise a waste of fuel.

Having a lower weight oil in the winter time also helps. 5w works best.
 
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CtownCyclone

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My 2017 4Runner is on a 10k cycle for oil changes. That's the factory recommendation. I didn't believe the guy when he told me, but it's right there in the maintenance manual.

When I had my Silverado, I used the Mobil1 oil that let you go 10k miles as well, along with the high-mileage filter. Never had any problems with it.
 

derpyherky

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Having a lower weight oil in the winter time also helps. 5w works best.

Actually 0w works best for winter, like 0w-20. 5w is old school.

For everyone's useful fact, the W doesn't actually mean weight, its actually the flow properties of the oil at cold tempratures.
 
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besserheimerphat

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Even if you are burning through oil the junk that makes oil - and your filter - dirty is still accumulating in there. I would recommend changing it on a regular schedule.
Yes, this. If you're constantly adding oil, you probably don't need to change the oil itself but the filter still needs to be replaced. But I don't know if any shop will do just an oil filter without also changing he oil. At 1qt/month, you're already replacing all your oil twice a year.
 
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NWICY

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The guys who sell you oil or you pay to change it recommend every 3 months or 3000 miles. The guys who design the engine say double or triple it.

Our GM vehicles have a oil life monitor, and I go off it. With my commute/driving habits its about every 8 or 9 months . . . :confused:

Mine isn't 8-9 months but go off the monitor like you 7500 miles or so for mine.
 

Three4Cy

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I would honestly take it out and put some miles on it every other week or so. I'd have to look it up again, but only driving a mile at a time can potentially cause engine damage because it isn't getting all the way up to operating temperature.

Completely agree - I had to have an oxygen sensor replaced in my daughters car who drives to school/work/see friends so very low miles, service advisor told me the best way to prevent issues like this was to take it out and drive it on the highway once a week.
 

NodawayRiverClone

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I'll go along with the folks who say about 6 months for an oil change if you are looking for the car to last a little while. As some have said, those short trips are hard on oil. Water accumulation in the oil will occur since the engine doesn't run long enough to evaporate it. Also, there used to be a thing called blow-by. Maybe not so much in today's cars, as tolerances are closer in engine parts. But, in cold weather in particular, the piston rings in a cold engine will have contracted a little, allowing burnt and/or raw gas past the rings into the crankcase as the engine first runs, contaminating oil.

Use the engine oil weight the manufacturer recommends for the car. Do not make a judgment on whether the oil looks dirty. It looks dirty shortly after it is used, but it is still effective oil.

You don't want to change oil too often, but an oil change is still much cheaper than engine work.
 

cyclonedave25

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I'll go along with the folks who say about 6 months for an oil change if you are looking for the car to last a little while. As some have said, those short trips are hard on oil. Water accumulation in the oil will occur since the engine doesn't run long enough to evaporate it. Also, there used to be a thing called blow-by. Maybe not so much in today's cars, as tolerances are closer in engine parts. But, in cold weather in particular, the piston rings in a cold engine will have contracted a little, allowing burnt and/or raw gas past the rings into the crankcase as the engine first runs, contaminating oil.

Use the engine oil weight the manufacturer recommends for the car. Do not make a judgment on whether the oil looks dirty. It looks dirty shortly after it is used, but it is still effective oil.

You don't want to change oil too often, but an oil change is still much cheaper than engine work.
Isn’t this what the PCV valve is for?
 

NodawayRiverClone

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Isn’t this what the PCV valve is for?

A PCV valve that's supposed to regulate the flow of these gases is the heart of mostPCV systems (some newer vehicles don't have a PCV valve). The PCV valve routes air and fuel from the crankcase back through the intake manifold to the cylinders rather than allowing them to escape into the atmosphere.

Yes. But I don't believe it eliminates all contamination.