I can guarantee you the Amsoil 5w50 full synthetic is worth the money compared to motorcraft full synthetic 5w50. I have oil analysis data from my oil changes for proof. I will post that information in this forum when I have the time.
a couple of things here....IMHO...
With the extended oil changes 5,000 up to 10,000 miles, withthe reduced ZDDP and the longer exposure to periodic oil filter bypassactivation, this is another parallel to the hydraulic timing chain actuatorsfailing at 50K to 100k miles as compared to their design specs which say theyshould be good for 150K+ miles. Those who have experienced these specificfailures, the majority report they are on extended oil drain frequencies- mostof the Ford Master Techs i have spoken diretly too regarding this, agree theirgut instinct says there is a relationship between the two.
With regards to Amsoil, it's nothing more than Mobil 1 with an additive and dye.....and as far as syn vs non-syn oils, today, all oils are are considered synthetic. While I amnot promoting this company nor their products, they have an excellent, detaileddescription as to how & why all oils today are considered “Synthetic” http://www.synlube.com/synthetic.htm
and was confirmed through legal proceedings http://www.scribd.com/doc/217558103/Motor-Oil-s-Day-in-Court
.Mfgs such as castrol, are actually using a oil base that is not by previousindustry standards to be even considered a "synthetic", was sued (ByExxon/Mobile IIRR) and they won in court because they were able to demonstratewith additives they were essentially delivering a syn product. When looking at all the refineries in the US(2014), the only one really capable of supporting 100% synthetic oilmanufacturing is Chevron/Phillips refinery in Texas…and it is not promoted as asynthetic oil.
As far as oil analysis goes, the majority of 'mail order" labs are a joke......"labs" in most states are required by law to be licensed and certified by that state.......most of the "oil analysis labs" are absent of this and just say, they don't have to have that...then they are NOT A LAB!!!! Inquire specifically about 1) what training and certification is required of the tech & supervisor? 2) how often does recertification occur? 3) How often is the "machine" recalibrated? 4) when was the last time it was calibrated 5) Who calibrates the "machine"? 6) What training is required of the tech that performs the calibration, when was their last certification? 7) the test "devices" (for calibration), where are they purchased from- the "machine manufacturer or ?
next time send in two separate samples, wait 3 weeks between submitting the 1st and 2nd one......2/3 rds of the time, they are totally different as a result of staff training, calibration or improper handling....
This is just an example of what an industry trainer see's on a daily basis... http://oil-analysis.testoil.com/?p=56 By: Tim Nelson, Technical Services Manager, InsightServices A company recently hired me to train their samplers. Thecompany used the drop tube method to collect their oil samples so I grabbed aline of tube and began waking around taking samples with a trainee. At thefirst piece of equipment I cut a line of tube and took a sample and then threwthe used tube away. The trainee immediately stopped me and asked why I wasthrowing away the tube. I was shocked to learn that he was taught to reuse thetube. Samples taken from a drop tube or drain port have ahighest potential of producing inconsistency among samples. In situations wheredrop-tube vacuum sampling must be used on circulating systems, the bestsampling location is between the return line and the suction line. This isknown as the short circuit. In addition, tubing should never be reused. Toavoid minimizing sample contamination a new line of tube should be used foreach sample taken. Does your plant have a standard method for takingsamples? Have all of your samplers been formally trained in taking samples? Doyou have questions about the different sampling methods?