Upto 4000rpm and sometimes above for short periods for the first 600 miles. Remember VARIANCE is the key factor but don`t be frightened of caning it now and again (more now than again). Several "knowledgeable" people are then using quality 20w50 multigrade with great success rather than semi-synthetic oil and the oil consumption has dropped to virtually zero. Using fully synthetic will stop the running in process. Hope this helps.