Towncivilian wrote:I'd rather run a conventional oil until break-in is finished (somewhere around 15-20k miles I'd think) at 3,750 mile intervals to save a bit of coin, and then switch to a synthetic of your choice. Always use 5W-30, no reason to use anything else.
From the Mobil website
http://www.mobiloil.com/USA-English/Mot ... il_1_FAQs4
Question:
Is it true that new engines need break-in periods using conventional motor oil?
Answer:
That is a myth. In the past, engine break-in was necessary to remove metal flashing or any other abrasive material left inside the engine after machining, as well as to allow the valves and rings to "seat" properly. Today's engines are built with much tighter tolerances, much improved machining, and under much cleaner conditions compared to the engines of 10 or 20 years ago. Current engine manufacturing technology does not require a break-in period using petroleum-based motor oils.
From the Pennzoil website:
http://www.pennzoil.com/learn-about-mot ... hetic-oil/
Myth: You should break in your engine with conventional oil before you start using synthetic oil.
Again, there’s no manufacturer we’re aware of that makes this recommendation. Mercedes, Porsche, Corvette, some Cadillacs, Volkswagen, Hyundai and many other manufacturers’ cars come from the factory with synthetic oil.
From the Castrol website:
http://www.castrol.com/castrol/generica ... Id=7017050
FACT or MYTH?
You can use synthetic oils without a break-in period.
Answer: FACT! You can start using synthetics immediately. A break-in period used to be recommended for a car's first oil change, but that's history now with current engine technology.