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High mileage oil ... 900 1994

posted by  Kane on  Sun Jan 30 15:37 CST 2005
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To say that synthetic is 10 times better is errorenous at best.

FWIW, Shell Rotella T, although conventional in nature, is hydrocracked (refined) to a much higher grade than regular conventional oils. Their properties are can even exceed lesser "synthetic" oils (many so-called synthetic oils are nothing more than hydrocracked conventional oil; Syntec is the #1 liar in this aspect.), and nearly to the extent of a real synthetic oil.

Along with other "million-mile" oils like Chevron Delo 400 and Mobil Delvac, they are designed as an extended drain oil, and doubling the interval is usually fine. OTOH, some "synthetic" oils are not designed as extended drain at all. Read the labels for the proper ACEA certifications.

-- Kane
--
Blossom II -'91 745Ti/M46 ... Bubbles -'74 144GL/BW35 ... Buttercup -'86 245GL/AW70
The Wayback Machine -'64 P220/M40 ... The ParaBox -'90 745GL/AW70






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