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ek4ever wrote:Yeah, but the manufacturer recommendation is based on conventional oil.... synthetic is a whole different storyStrugglerzinc wrote:adnj wrote:Everything that you need to know regarding oil change is in the owner's manual. If you choose to change at a different interval or use a different engine oil spec, it is your perogative.
This. Everyone thinks they know better than the manufacturer.
Air filter?... Care to elaborate on thatadnj wrote:ek4ever wrote:Yeah, but the manufacturer recommendation is based on conventional oil.... synthetic is a whole different storyStrugglerzinc wrote:adnj wrote:Everything that you need to know regarding oil change is in the owner's manual. If you choose to change at a different interval or use a different engine oil spec, it is your perogative.
This. Everyone thinks they know better than the manufacturer.
Many manufacturers, in various engine families, specify the use synthetic engine oil only. It is not unheard of for some OEMs to also specify a specific brand of oil.
When new drive trains are being developed, lubricant manufacturers are brought on board to provide a set of specific lubricant qualities. These form the basis of new lubricant specifications.
In my experience, many issues associated with engine oil is attributal to owners that refuse to service the air filter at the recommended interval.
Aaron 2NR wrote:Poor air filtration allow elements into the system which can then be found in the oils which promote wear metals
kamakazi wrote:How does refusing to change an air filter allow more dirt in?; Are you saying that the filter collapses and or fails?
kamakazi wrote:How does refusing to change an air filter allow more dirt in?; Are you saying that the filter collapses and or fails?
kamakazi wrote:so to answer adnj.
Yes that is a possibility but only in older vehicles that don't have any real emissions control systems. Modern engines will detect the lower volumes of air (if the filter is dirty) and subsequently pump less fuel to match; which negates a lot of soot formation (because emissions).
You are specifically referencing fuel economy and emissions. In steady state tests like those used for fuel economy, I do agree but performance takes a hit. Under hard acceleration or heavy load, the fuel mix goes rich.kamakazi wrote:"Counterintuitively, dirty air filters don’t affect fuel economy or emissions on computer-controlled gasoline and diesel engines, as long as they were built after the introduction of closed-loop oxygen sensor feedback systems. Modern computer-controlled engines can adjust fuel injection to compensate for a dirty air filter, but carbureted engines depend on air flow for fuel delivery."
http://knowhow.napaonline.com/what-could-a-dirty-air-filter-do-to-your-engine/
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