What is the highest oil weight you can put in your 4.6L ?
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Greenscobie86
Member
My dad has a problem with oil comsumption on his 5.4 van. After trying everything: new pcv, FL-820S Motorcraft OEM filter, thinner oil, thicker oil, NOTHING seemed to help.
Finally we said $crew it and started using M1 15-w50 and it helped significantly.
Although these mod motors shouldn't be run on oils thicker than 10-w30 due to tight clearances in the heads, dad's van is running very strong with 200k on the clock.(started using M1 15-w50 at 140k)
Another interesting tidbit of info I found out on the forum I use for my Expedition(also 5.4) is that FoMoCo changed the oil viscosity requirements for all modualr V-8s produced from 1991 to present to 5-w20.
Yet another interesting thing is that my Expedition with almost 100k uses no noticeable oil(M1 5-w30) between changes.
Just my 0.02 cents.
Good Luck!
Finally we said $crew it and started using M1 15-w50 and it helped significantly.
Although these mod motors shouldn't be run on oils thicker than 10-w30 due to tight clearances in the heads, dad's van is running very strong with 200k on the clock.(started using M1 15-w50 at 140k)
Another interesting tidbit of info I found out on the forum I use for my Expedition(also 5.4) is that FoMoCo changed the oil viscosity requirements for all modualr V-8s produced from 1991 to present to 5-w20.
Yet another interesting thing is that my Expedition with almost 100k uses no noticeable oil(M1 5-w30) between changes.
Just my 0.02 cents.
Good Luck!
I would only run the specified oil such as 5w20, or 5w30, but if his motor is burning oil, try anything. It can't hurt, if it's already on it's way out.
CobraRed_96_GT
Active Member
Hardtop68
Founding Member
I red on a Ford TSB that if your modular is using 5w-20 you can go thicker it will only hurt fuel economy BUT IT IS NOT RECOMMENDED on DOHC's (Cobra) due to closer clearances... If I remember well, I red that on www.p1interceptor.com (?)
It looks like it is time to start looking at that PI swap. While you are there you can take a look around and replace what needs replacing.
trinity_gt
10 Year Member
No filter I have tried matches the Motorcraft in keeping engine racket to a minimum during cold start. While those filters may have superior media (e.g. finer filtering or whatever), none I've tried seem to be able to match the Motorcraft anti-drainback valve effectiveness, for whatever reason.
As for oil thickness, I don't buy the notion that you can't run thicker oil in these engines because the modular allegedly runs tighter clearances. It's a mass-production piston engine, not a Swiss watch movement. Piston and journal bearing clearances are industry standard stuff. Ford recommends running water -- er 5W20 -- in the crankcase purely for fuel economy.
The filter media (paper) is packed tighter in Motorcraft and Pure One so they do filter better but they tend to clog and have flow issues. The WIX have a cotton media that prevents flow problems.
trombonedemon
Well-Known Member
Thats funny stuff.People sometimes forget the mod engine is also a truck engine.
10w-30 can be ran as well.
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