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I have a 1999 BMW M3 with a high mileage engine. It is only driven on the street but I do drive it hard some times. Right now it is using about 1 qt per 1000 miles of redline 5w30 and this is common for these engines. One of the top engine builders recommended that I switch to Rotella T5 10w40...

Hi I have been running Redline 20w50 in my street/track-day RX-7 with a two rotor 13B rotary engine. This car is mainly driven to the track and driven hard, then back and garaged. I just rebuilt the engine and am thinking about switching to Idemitsu after the break-in. I have read that it is...