Quote:
Originally Posted by lewdog
My FIL ran Royal Purple in my car and changed the oil every year since the car didn't get driven 3k in a year anyway. He is telling me to still use Royal Purple (which is fine) and still change every 3k anyway. He's also one of those old quirky guys who just likes to stay busy and that doesn't make much sense to me. Thoughts? Every 5k for that engine (4.6L) for a Mustang GT (15k miles)?
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Many manufactures have a schedule of 10-15k on good quality synthetic. Suspect a little of that number may be due to the maintenance programs included with new cars. Have read some arguments on performance cars that you may be driving hard so you should change every 7.5k but many say 10k is fine if you are not doing stuff like tracking it.