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Use recommended oil, our cars are from the old+ (archive)
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Posted by Keith F on April 21, 2002 at 11:40:59:

In Reply to: Bosch Platinum plugs?Oil Weight?Water on Floor? posted by Mike R. '83 733i on April 21, 2002 at 02:50:23:

school and were designed for a thicker oil. I use 20W-50 year round, won't change. Newer cars are designed to use the thin oils like 5W-30 and do so for fuel economy reasons. Our engine tolerances will not work with these this oils.

In the 735, the platinums have had complaints, but do not know about the 733. Only other plug to get high marks for the 735 was the NGK, recommended by Steve Haygood, who has sold and used them for years.

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