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around when it's time to change my oil again(3500 on the new motor) i'm thinking about going with amsoil 10w40 or 15w40. i'm running delo 400 15w40 and it's great stuff. no leaks, except from the damned half moon gasket
The article provides some information directly from synthetic manufactures (Redline, Amsoil, Syntec, etc) but they don't all agree on everything. It explains how and why synthetic oil got a negative reputation and how it is different now. It also provides some reasons why auto manufacturers still recommend 3,000 miles changes (My synopsis: Due to warranty concerns manufactures like to have the opportunity to periodically inspect the cars). The bottom line is that synthetic oils are always superior to petroleum oils; however, under normal driving conditions the difference may not be noticeable. Synthetics maintain their chemical properties at much more extreme temperatures (above 400 degrees and below -30 degrees), but how often are then conditions seen? Using them can be beneficial if an engine failure is experience. If a motor overheats, for example, a synthetic oil will provide better protection. Is it possible that some of the differing opinions on drain interval are a result of the difference between Group III and Group IV synthetics?
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