Motorcraft 5w-30 oil

not really bs dude there are a ton a variables that have to take place too many to consider. it can happen when switching on a high mileage motor. there is eventual sludge buildup that happens that blocks leaks, thus his concern. if its a brand new motor under70k thats been well kept no problem. on the switch. high milage never run on a syn blend better to be cautious and be ready for a potential (key word)leak.


STILL BS !!!

Drive a car proper and no sludge build up with dino oil. (fact)

So your statement only appplies to a non-maintained engine.

My proof:

Switched to FULL Syn, 4 diff brands

130K 460
200K 302

No problems,SLUDGE or LEAKS !

The Expert

We switched to full synthetic in our van with about 90k and it developed a leak. We switched back to non-syn and leak is gone. I believe that its because syn is a thinner/finer oil, it can seep through where a normal oil won't. Just my thoughts...for what its worth...probably nothing haha

Lets see, 6 used cars with unknown historys.

None of the internet myths proved correct.............

point, take care of car..................

Cavallo said:

Lets see, 6 used cars with unknown historys.

None of the internet myths proved correct.............

point, take care of car..................

Click to expand...

i can live with that

LOL and for the record i wasnt saying it will happen just that there is a chance if it hasnt been taken care of like ive said before on mods and stuff what works on one car may not work on the other. not every car is the same and niether is the driver. the point remains take care of it.

The synthetic causing leaks problem is just a myth that has gone way out of control.

Wow..there are some uninformed people in this thread.

Visit RP's site sometime, or AMS Oil. You'll see the very concern you're claiming is a myth, addressed and explained by each company.

straight from the royal purple website faq

there can be an issue in the higher milage motors
http://www.royalpurple.com/techa/faqsa.html

Will synthetic oil cause my engine to leak?

Properly formulated synthetic oils will generally not cause an engine oil leak. Synthetic oils possess a higher degree of natural solvency, which can clean and remove deposits left by other oils. The removal of extensive oil deposits can expose marginal or damaged oil seals that may then leak. If an engine currently has excessive oil consumption (i.e. greater than 1 quart / 1,000 miles) the recommended course of action is to solve the oil consumption problem before switching to a synthetic.


again this rienforces if its a new motor from the amsoil faq.

http://www.amsoil.com/frequent.aspx#consumption

Will AMSOIL Motor Oils decrease oil consumption?

Yes. When used in mechanically sound engines, AMSOIL Motor Oils can reduce oil consumption. Under test conditions, a reduction of as much as 42% was demonstrated for prolonged periods. However, this should not be taken to mean that AMSOIL Motor Oils are “cure-alls” for engines that consume oil because of mechanical problems.

all in all if you are going to switch its better to do is soon than later.

sgarlic said:

Wow..there are some uninformed people in this thread.

Visit RP's site sometime, or AMS Oil. You'll see the very concern you're claiming is a myth, addressed and explained by each company.

Click to expand...

I would've done the copying and pasting, but I wanted somebody else to read it as well. Thanks. And there you go above posters who say it's a myth. You're wrong.

You'll be fine running the Motorcraft
semi-synthetic blend or their full synthetic. Your call - just monitor the situation accordingly.