Originally Posted by deadpandan
my ford dealer charges $99 for full synthetic with all that other stuff checking fluids, tire rotation, etc. when i saw i that i decided it was better if i just did it myself. and as far as why Mobil 1, i wanted an oil from a top tier company and not having to change the oil every 3-5k miles sounds great to me.
Just what are you going to gain with the synthetic oil besides claimed extra long times between oil changes? On regular ford oil the factory says you can get up to 10K. I would never do that even with Synthetics. On GM engines I do about 3K between changes, they have problems in my 5.3 truck engines already at 50K. Had pan gaskets replaced, still leaks and burns; stupid AFM.
With the Deep sump on the 3.7 Cyclone, I do 5K which is half of what Ford says you can do on Stock Ford oil seems to be working well based on the sample I get from the changes; and just perfect for ROT of the tires at the same time.
Unless advertizing claims can be proven, I don't see it a deal. Fake oil as it sometimes is called is looked down on by a group that says DYNO oil from Dinosaurs is better; who is right? Its all in the money trails. It's marketing, opinion, and faqs from corporate scientists that used to say smoking did not cause cancer
Edit: you warranty claims are more valid using stock ford DYNO oil at the Dealer for $29 than changing it yourself. Top Tier oil is like Top Tier Gas, who has it and who can prove it? (Check into gasoline distribution and that set of ad scams) Engine claims for failed rings or scored cylinder walls (like Chevy AFM) can't be dismissed if you were doing Dealer oil changes.
The 5.3L AFM problem is about the only engine problem I have seen that oil changes done properly can't prevent (bad design). Good designed engines, you keep changing oil and filters and they run good. Bad designed engines you make sure you do everything the factory says you should do so they cant deny warranty.