looking for a new bimmer oil....

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yeah, i certainly do like to horse around
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The relatively warm temperatures in SF year 'round do not justify the usage of a synthetic. Just run 15w40 year 'round at 4-5K drain intervals.
 
where temps dont go below 10f, I use 20w50 in my M20s. the newest one has 250k on it. It may be excessive valve lash causing the noise. Warning: dont Adjust them too tight, noise is preferable to burned valves.
 
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