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BMW recommendation = BMW 5W30 HP Synthetic (archive)

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Posted by kwillmorth on August 03, 2000 at 09:43:30:

In Reply to: need input on oil posted by woody on August 02, 2000 at 19:58:19:

Read the owners manual, any oil that is properly certified is acceptable. Oil service lights are programmed assuming extended range BMW HP synthetic oils are being used i.e. 5W30 (by Castrol), or 5W40 (by Valvoline). The old days of "thicker is better" has been pretty much wiped out with the latest synthetics. Using thicker oil in an engine designed for the 5W-X oils wastes energy, results in reduced power and may even cause additional wear. It's tough to change conventional wisdom, many still don't buy the extended range (7500 miles between services), or the lighter weights (5W30 vs. 10W40 or 10W50), but... the reality is, the stuff works great, the car is designed to use it, and the warranty supports it.

The only other alternative for the M cars is to use BMW "Special Oils", which are mineral based (read conventional), which are semi-synthetic (conventional petroleum base with synthetic adders). But these offer no advantage, are more expensive, and do not tolerate extreme heat conditions as well as the HP synthetics.

need some help with oil type and viscosity. no one in little rock seems to know what oil i should be runnin'. you guys seem to be on top of it. 2000 m coupe-10,000 miles. thanks

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