Thanks Rick for the reply. My Euro version has the German manual so I first used 20W-50 by looking at previous oil change records and changed it at 3000 miles. This next round I used the same brand but a 10W-40. My oil still looked clean with 3000 miles and I heard that due to the large sump size of 8.5 qts that the oil change interval could be extended. Thanks for clearing this up. One day I will be able to pick up a English version owners manual. Here in southern Arkansas it gets hot!! Thanks again......Eric

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Eric Boyles
1980 450SL