Greetings,
Ive got 60,000 on my 2000 sc2 . Oil changes with QS 5w30 every 3,000 miles . Mostly highway about 3000 miles a month. Im looking to go synthetic to increase the change interval to about 7500 miles. Is that a safe range for the Mobil 1 oil? Should i still change the filter at 3,000 and top off the lost oil? Mobil 1 seems highly regarded here so lets have your thoughts. Thanks