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SVTPerformance's Chain of Restaurants
The Greasy Spoon
73k changing motor oil
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<blockquote data-quote="gen.turner" data-source="post: 12813254" data-attributes="member: 128108"><p>This is dead on. These are the nuggets of positive intelligence/wisdom that this site is made for. </p><p></p><p>The reason that people say that you should not switch brands back and forth alot is due to the different mineral and additive packages that oil companies use to allow their oils to resist breakdown whilst coating the cylinders and leaving protective film on the bearings. Think of it this way if you put oil "blue" in your engine then, over time the additive packages in the oil will create a protective film on the cylinder walls and bearing/other wear surfaces. Then say you decide to switch to oil "green", because of price/availability/wieght whatever, the problem exists that the additives in the oil could "clean" the protective coating of oil "blue" to replace it with "green" protective coatings. This will lead to a short period of cylinder and bearing wear surfaces being succeptable to increased wear during the transition. Obviously I cannot document/cite specific scientific studies to support my statement but the generally accepted rule is pick an oil and stick to it. The "gunk" you are referring to could be a mixture of the cleaning agents doing their job removing the previous additived from the wear surfaces and actual soot from combustion/normal wear.</p><p></p><p>Also the viscosity plays an important role in the 4V because of the hydraulic followers and hydraulic chain tensioners require lubrication without restriction to flow. After xxx thousand miles I seriously doubt that your clearances are the same as new. The good news is that unless you have the new VVTi hydraulic phased cams,which relies on different oil pressures to change the phasing of the camshaft to load, changing up or down 10W shouldnt be a factor.</p><p></p><p>The main point is find something your comfortable paying for every oil change and use that oil. I've seen way to many people change their oil brand every time they change their oil based on their budget. Do your own research, make your own decision. Every one has a different combination/goal/idea of what they want out of thier car.</p><p></p><p>I figured the explanation would stop this from seeming like my personal preferance.</p></blockquote><p></p>
[QUOTE="gen.turner, post: 12813254, member: 128108"] This is dead on. These are the nuggets of positive intelligence/wisdom that this site is made for. The reason that people say that you should not switch brands back and forth alot is due to the different mineral and additive packages that oil companies use to allow their oils to resist breakdown whilst coating the cylinders and leaving protective film on the bearings. Think of it this way if you put oil "blue" in your engine then, over time the additive packages in the oil will create a protective film on the cylinder walls and bearing/other wear surfaces. Then say you decide to switch to oil "green", because of price/availability/wieght whatever, the problem exists that the additives in the oil could "clean" the protective coating of oil "blue" to replace it with "green" protective coatings. This will lead to a short period of cylinder and bearing wear surfaces being succeptable to increased wear during the transition. Obviously I cannot document/cite specific scientific studies to support my statement but the generally accepted rule is pick an oil and stick to it. The "gunk" you are referring to could be a mixture of the cleaning agents doing their job removing the previous additived from the wear surfaces and actual soot from combustion/normal wear. Also the viscosity plays an important role in the 4V because of the hydraulic followers and hydraulic chain tensioners require lubrication without restriction to flow. After xxx thousand miles I seriously doubt that your clearances are the same as new. The good news is that unless you have the new VVTi hydraulic phased cams,which relies on different oil pressures to change the phasing of the camshaft to load, changing up or down 10W shouldnt be a factor. The main point is find something your comfortable paying for every oil change and use that oil. I've seen way to many people change their oil brand every time they change their oil based on their budget. Do your own research, make your own decision. Every one has a different combination/goal/idea of what they want out of thier car. I figured the explanation would stop this from seeming like my personal preferance. [/QUOTE]
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SVTPerformance's Chain of Restaurants
The Greasy Spoon
73k changing motor oil
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