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Re: guys/gals, a quick question re synthetic oil ( (archive)

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Posted by MicahO on December 13, 2000 at 16:16:04:

In Reply to: guys/gals, a quick question re synthetic oil (m) posted by from e46 board on December 13, 2000 at 15:37:14:

Synthetic oils have a more stable base that allows them to withstand higher temperatures and greater frictional forces for longer periods of time without breaking down. BMW recommends them because it gives greater protection for the engines of the ultimate driving machine (and allows them to charge more money for BMW labelled oil). Similar reasons apply to Synthetic ATF and Gear Oil.

One can run dino oil in a BMW engine, without problems, probably for a long long time. Just follow a shorter oil change interval than would be specified by the dash lights. 4K oil changes should be regarded as a maximum with dino oil in any engine. Would there be 'damage avoided?' Probably only in extreme conditions; synthetics would handle friction caused by an overheat or extreme cold start much better than dino oils.

Some folks on this board who run synthetic oil go as much as 10K miles between changes. This would never be a safe possibility with regular dino oil. If anyone is doing any sort of autocrossing or track time where engine speeds would remain at an elevated level for longer than in normal driving conditions, they would want both Synthetic oil AND shorter oil change intervals.

Look at or for some synthetic information. (very punny!)

Micah O'C
'92 525iT, Mobil-1 from stem to stern

does anyone know of any 'real' reason why bmw recommends the use of synthetic oil on new cars? i mean, what is wrong with using regular oil, grade optional depending on weather conditions etc. ? please state 'real', meaning, technical reasons for using synthetic, not just because 'it's better', 'voids warranty', i mean what damage could be avoided by using synthetic. also, doing regular oil changes at the usual 4K mile intervals applies. thank you.

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