I go only as fas as 5,000 with full synthetic. The insurance cost is so low comparison to future catastrophic events, it makes no sense to go any longer.

John,
If you read up on direct injection engines -- You'll notice your engine is more likely to have problems or break down due to the build up of carbon in the inherited design of direct injection vs oil change intervals. Watch this youtube video - I recommend you jump to the 2:30 mark. it gets to the good part around 3:00 and at the 5 minute mark you'll see what I'm talking about.

Plus a place that sells oil for a profit even recommending not to do it so much
https://shop.advanceautoparts.com/r/...hange-interval

and another article.
https://www.edmunds.com/car-news/tip...-your-oil.html

This is a good video. I change me oil every 5k miles using a full synthetic. I keep my vehicles for a long time. I have 55k on my MKC and plan to keep it up to 200k. If your going to own your direct injection vehicle long term it pays to do frequent full syn oil changes.


My 2 cents
Sanman

Buckeye great video

Does anyone know if Ford has developed an approved cleaning process yet? The youtube video above is from 2015. I see that CRC had developed a spray treatment, but I have no idea if it is Ford approved.

VW never found a way to clean the build up. The problem is: nothing you put in your gas tank will get in contact with the build up. Sounds like you need to take the cover off to get to the top of valves. I think Ford/Lincoln sells something to clean it -- but it is probably 1-10% effective.

The best way to clean the back of you intake valves is to take of the intake manifold and spray an aluminum safe carbon solvent directly on the intake valves. Spray only the closed valves allow the solvent to soak. Vacuum out the solvent when done. Rotate the engine to do the other valves. After you are done change the engine oil.

Our MKC 2.3L had 28K miles when we bought it from a Toyota dealer. I asked what oil they used, they service all used vehicles, and was told it was full syn. They also had free service for the first year so when I took it in for the included oil change I confirmed that they used full syn. It seemed to be the norm for turbo engines at that dealer and their sister dealership next door which is a Ford/Lincoln dealer.

My F150 4.6L specs syn blend.

I use Amsoil Signature Series 5W30 and go by the oil life monitor (Document the %), which usually is about 6500-7000 miles. Amsoil's SS oil line is listed up to 25K.

I use Motorcraft Filters.

Used Oil Analysis's have been pretty clean and Blackstone has told me I'm changing it too soon. But it's under warranty, so I say safe.

IIRC the Manual says 10K for OCIs.