curveball953

Just got a 2020 ford f150 supercrew xlt 3.5 v6 they put in just regular oil ...next oil change I want to go full synthetic is that ok give me your thoughts ...tks

ReaperHWK

Why wouldn’t it be? Common myth spread online.

I find this guy to have very good information on everything oil related:
https://youtube.com/@themotoroilgeek?si=3Lqg8C0VNQhOCbwf

GMC to Ford

It is not really a myth for 40 plus year old vehicles using cork gaskets. Synthetic oil was known to cause those gaskets to leak when the oil crude was dissolved by the higher synthetic detergent levels. However, it is definitely a myth for newer cars since the gasket material has changed and improved. I had to replace my oil pan and valve cover gaskets on a 1973 Monte Carlo after switching to Mobil 1 sometime around 1980. The car had 73,000 miles when purchased.

bajaman

Man, I haven't seen an oil thread for...at least three minutes or so...

ReaperHWK

that has good information on this topic. That’s also a myth when talking current synthetics. Any modern synthetic is compatible with seals from these older cars as well.

synthetic is superior to conventional in every metric except cost…….

wde3477

FWIW, been running the Motorcraft 5W20 oil and Motorcraft FL500 filter since I bought my truck new.

Obviously don't have enough miles or age yet to definitively tell any difference, oil consumption is still near zero with no other ill effects noticed, just continuing with the OEM spec for best hopes on longevities.

Wouldn't doubt that there are better oils and better filters out there, just not feeling like a research project at this time with some unknown cost premiums and uncertain outcomes or returns on extra investments.

ReaperHWK

if you change regular oil frequently should be fine for a “normal” motor that’s not racing or at extended high RPMs.

all that being said I own a 2006 f150 I bought new and it has 210k miles. Doesn’t burn a drop of oil between changes and also has never had engine issues such as the common phaser problems. Never once has the valve covers been off. I did have to drop the oil pan once(at 190k miles) to free a siezed dipstick. Not one drop of sludge in there on and internal engine components I can see. Also the bottom of the plan was sludge free. This truck had full synthetic since new changed at 5k miles religiously.


i own a hellcat and to keep the warranty full synthetic is require every 5k miles or 6 months….. regular oil will void it.

I’m a big believer that running full synthetic will improve the longevity of any motor. The death of any engine is wear and oil starvation; synthetic is the answer to both. Especially top ones such as penzoil ultra platinum which are made from Natural gas (super clean).


https://youtu.be/hqBJQ23NFYc?si=6qfBhlWY9IkYAg8r

N4HHE

It wasn't just cork gaskets. Vinyl oil seals would swell with motor oil, differently depending on the motor oil because the SAE/API specs didn't yet standardize on seal swelling.

It wasn't just an admonition against "changing to synthetic" but one of "select one oil and use it until the next rebuild" to minimize oil leaks. But in today's environment all the basement armchair experts can remember is "synthetic".

mass-hole

There is no such thing as regular oil anymore. No one makes straight dino oil because it wont meet the current standards.

pjc123

I have always run Mobil 1 in everything; cars, trucks, lawn mowers and motorcycles (Motorcycle specific Mobil-1). I worked with a guy who races dragsters and he showed me the wear difference on parts with dinosaur vs synthetic oil. That did it for me.