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April 24, 2024, 11:53 pm
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5W30 vs 10W30
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I've been doing a lot of driving over the past few weeks, so I decided to get an oil change today and purchase new windshield wipers. Since the manager of the local Tire Kingdom was very nice to me last time I was there, I decided to go there instead of the dealership. Actually, the Toyota dealership is also very helpful, but they're more expensive and I don't need my tires rotated or any of the extras this time that might justify charging $34.95 plus shop fees & tax for an oil change.
When I got home I noticed Tire Kingdom used 6 quarts of 10W30 and I know the dealer uses 5W30. I realize that the 5W30 is thinner and is recommended for colder climates and that 10W30 is pretty standard. But I've also read online that using the high viscosity oil could result in "sludge" building in the engine. I've been on sites like Cars.com and others have asked the same question about which oil to use. Most answers said to use 10W30 in a mild climate.
I've learned the hard way that, when in doubt, read the Owner's Manual which specifically says to use 5W30 in all climates and says that 10W30 will result in poorer gas mileage. It also says that if it's necessary to use 10W30 because 5W30 is not available, to change to 5W30 next time the oil is changed. Mobil1 is what the dealer used.
This really concerns me. Isn't Mobil1 synthetic? Will this change to the other oil void the warrantee? Would you go back to Tire Kingdom? I guess using it only this once shouldn't have any damaging effects, but I'm wondering if they used the 10W30 because it was cheaper. The receipt says "bulk oil" and I'm not sure what that means exactly, except they buy an awful lot of it!
Okay - just read more information on the recommended oil (which is still 5W30) but there are several people who say that in very hot weather 10W30 is actually better because it won't break down and provides better lubrication. Except for Death Valley and Phoenix, I doubt if there could be many places hotter than Southwest Florida!
Comments
Yes mobil 1 is more expensive about 6 or 7 dollars a guart.
bulk oil I think would mean is that they buy it in 50 gallon barrels.
If you are within your manuals recomendations I would think you are good to go.
WD40? Pac, at least you didn't suggest KY-Jelly.
Dear Tom and Ray:
My husband and I disagree about what grade of oil to use in his '99 Explorer. He refuses to take his car anywhere other than the Ford dealer because he gets mad when he sees others use 10W30, when the owner's manual calls for 5W30. It seems that everybody uses 10W30 at the non-Ford dealerships. I guess I should also mention that we live in Texas and don't get the cold winters that people get up North. But my husband claims that there HAS to be a reason other than temperature why Ford wants 5W30 in its engines. Why do they recommend 5W30? Give me a good answer, or I might have to trade in my husband before the lease is up! -- Linda
Ray: Well, we should first tell you what the multi-viscosity numbers mean. 10W30 means that the oil acts like a thinner, 10-weight oil when it's cold and like a thicker, 30-weight oil when it's hot.
Tom: So a 5W30 oil would be the same as a 10W30 once the engine is hot, but it would be thinner when the engine is cold (when it hasn't run for several hours). And that's why Ford, and most manufacturers, now recommend it.
Ray: A thinner oil flows and spreads more easily when you first start the car. And the faster it spreads, the more quickly it lubricates important moving parts. Presumably, that makes the engine last longer, because less friction damage is done during those first few seconds after starting.
Tom: How much difference does it actually make? We have no idea. Probably not a whole lot. It certainly makes less of a difference in Texas, where the outside temperature stays higher and the oil never gets quite as viscous.
Ray: So I'm sure it would not be a disaster if you used 10W30, but given a choice, I'd go with Ford's recommendation and use the 5W30.
Tom: And the reason a lot of shops use 10W30 is because it's the closest thing to a "one size fits all" oil.
Ray: Plus, mechanics love what it does to their hair.
WD40? Pac, at least you didn't suggest KY-Jelly.
Should I have?...lol
Atleast we know where it's made...lol....In Kentucky...lol
Maybe too much....lol
Jarasan, I agree that maintenance is important. My dealer said every 5,000 miles is fine. After this last oil change, however, I will probably go back to Tire Kingdom in 3,000 or less. I also have a Gift Cert for an oil change with "bulk oil" so I'll ask if it costs more for 5W30 or a brand name. I know they sell Pennzoil at Tire Kingdom. That said, True Critic makes a valid point. I think it might be like buying generic Tylenol or Advil. Many people don't notice a difference and say since they all have to meet FDA regulations and contain the same ingredients/strengths, you're wasting money with name brands, but I often notice a difference.
Climate Considerations
Owner's manuals and service manuals will specify the acceptable oil to use at various temperatures. In warm climates, 10W30 is usually an acceptable alternative to the preferred 5W30 and may be used without measurable adverse effects. In the olden days, before multi-weight oils, it was common to have a winter oil and a summer oil. This is no longer necessary, but if you normally use 10W30 because you live in a warm climate then be sure to switch to 5W30 if you plan on using the vehicle in very cold weather.
5W30 versus 10W30
Virtually all new passenger vehicles sold in the U.S. use either 5W30 or 10W30 oil. The difference between the two is that the 5W30 flows better when cold, so if you live in a cold climate or operate your vehicle in a cold climate during the winter months, you should use 5W30 if it is the preferred oil for your vehicle. If you live in a sub-tropical climate and don't operate your vehicle in cold climates, then 10W30 is acceptable as long as the manufacturer specifies that it is permissible to use it.
Is there a disadvantage to using an oil that flows better when cold, i.e. 5W30 versus 10W30?
Sometimes, but usually not. The crux of the issue is this: the bigger the difference between the cold oil viscosity and the hot oil viscosity, the more the volume of viscosity modifiers and the less the volume of base stock. If you are good about following the manufacturer's recommended oil change interval then stick with the 5W30 if that is the preferred oil for your vehicle, even if 10W30 is acceptable in warmer climates. Older cars may specify 10W30 only. This is because they need a little more viscosity when cold to keep a protective film on the cylinder walls. There have been instances where the larger amount of viscosity modifiers that are present in 5W30 have broken down due to excessive heat and have left carbon deposits on the valves, but this is extremely rare. The proper fix would be to reduce the excessive heat, but the workaround was to use an oil with less viscosity modifiers.
I can remember the 10 and 30 weights changing from summer to winter.
When I use to have a car that started to burn oil I use to put 40 weight in it. Along with ring seal additives.
Well, I had another short panic attack. But I figured it out. The warning light for maintenance wash flashing and wouldn't go off. I think I was able to reset it...pretty simple actually. I had my last oil change at the dealership at about 23K miles and I have 27, 700 and the manual says that's when it will begin to flash. So I guess it was just a coincidence that it happened right after I had the service performed.
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