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Originally posted by RagerXS
In truth switching to synthetic oil SAVES YOU MONEY. As well as time, all while protecting your engine better. The only caveat is that you have to use a brand that stands behind their product rather than wanting to rip you off...
AMSOIL was the first to recommend extended drains and to this day remains the company with the longest recommended drain interval in the market (up to 35K miles). Neo offers some extended drain products (up to 25K), and Redline (up to 18K). If you ever wondered why Mobil1 is less expensive, consider that they like to advertise meeting European specs that require the oil to perform better and provide an extended service life. In fact Exxon/Mobil supports an extended drain interval in Europe. So why don't they do so here? The only two possibilities are that they would much rather consumers drain good oil so they can increase sales, or that they actually distribute a lesser quality oil here and falsely advertise meeting the European spec. I surely doubt it's the latter since they sued Castrol for false advertising. But nonetheless it doesn't make me want to purchase their products.
Back to the point, if you follow the extended drain interval recommendations you will save money. We bought Toyota trucks because we knew they would last -- draining good oil early is like trading in your truck early, and if you plan to do that you could have paid less for another brand...
~ Fred
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Like you said, more than likely the reason that Mobil 1 recounted their claim of extended drains is because that means more revenue for ExxonMobil here in the US.
On a side note, I believe another reason that Mobil stopped advertising the extended drains was due to Consumer Reports publishing an article in 1996 on motor oils. I don't put nearly as much credibility into CR as I used to. The details of the article are a bit sketchy since I have not read it in several years. According to CR , if I remember correctly, they claimed that while some of their test taxi cab engines, which I beleive were rebuilt, had normal rates of wear using the extended drains with Mobil 1, a couple of their engines developed mechanical problems. I'm not sure if CR changed the oil filters during the recommended intervals on the engines or not, something you have to do on extended oil drains. I think Mobil stopped advertising their 12,000 or 25,000 mile extended drains shortly after the CR tests.