I recently had this conversation on another forum. Do you guys think MJ_Alexander's comments have merit?
ME: > Conventional/natural oils come with contaminants even when > brand-new: waxes. These waxes thicken inside the engine to > become sludge. Synthetic oils do not have these waxes. > > Conventional oils are also overloaded with Viscosity Index Modifiers > that (a) burn-off/sludge in your engine and/or (b) interfere with > lubrication. Synthetics have no or virtually no VIMs. > > So you see there is a difference in quality between > conventional/natural and synthetic.
quote:[ June 03, 2003, 02:23 PM: Message edited by: RCmodeler ]
MJ_ALEXANDER: The wax issue in conventional/natural oil is a myth. Synthetic oils need other additives, such as rust inhibitors to prevent rusting inside the engine. Something which conventional oil does naturally. There may be such differences, but are they worth the added expense? Personally I doubt it, unless you subject your car to very extreme conditions. Such as racing, driving in the desert, driving in the arctic, towing heavy loads, etc. All the 'tests' I've read about only use the synthetic in the extended testing and conventional as the standard interval. Have you seen a test where they ran both under the same tests and conditions? (The NY cab test didn't run conventional oil past the 3k, only the synthetic) I would be glad to change my thoughts about synthetic if I could be shown actual proof of its value to me.