112,000 miles 2000 f150 5.4. been using castrol gtx high mileage, is it ok to switch to the castrol syntec blend withotu and problems? will the syntec blend clean a little better? also if i did switch will it still be good to ru nthe Motorcraft filter with it? thanks

 

Since 112,000 ISN'T high mileage for a modular motor, I would say yes.

 

haha sweet man, just checking. so ill use that and a MC filter then. sound good?

 

Yea, always run the correct filter.

 

yeah, very inexpensive as well. thanks for the advice bud

 

No problem. Hell, I have over a quarter million miles and she still purrs like a kitten; - a work horse as well. I'm always pulling something, lately lol.

 

haha same here, but im only at 140k tho and arent high milage motor oils basically synthetic blends IMO if your gonna use a synthetic blend might as well use full synthetic

 

No no - not full synthetic, specially with over a 100,000 miles. Just the blend

 

oh....so i should stop using full synthetic

 

No, if you are presently using full synthetic with no burning or leakage issues, keep using it.

 

Agreed: I use Quaker State, 5W-30 Full Synth most of the time. My other favorite is Castrol Syntec Full and Blended Formula. My mileage is over .25 mil. on a 4.6Ltr.

 

i know a guy that put 3 or 4 completely different oils in his engine at once. he has a 95 f350 5.8 5 speed. the guy didnt finish school and couldnt read but he always brought his own oil for an oil change and he'd have something like a qt of 5w20 full synthetic, 2 qts 5w30 syn blend, a qt 15w40 regular oil, and you get the point. sometimes they were the same brand and sometimes they were 4 different brands. he never had an engine blow up on him though. his truck is still running with almost 150000 miles(last time i saw it). he did the same thing with all his farm tractors.

 

I changed over at 71K and at 92K i blew the motor(detonation - Nothing to do with oil) and when i took it apart it looked brand new and i mean brand new!



The cylinder wall still had the honing marks!

Wayne

 

You tell me.

It's the switch with high mileage vehicles I'm referring to.

It depends what your switching from and/or how dirty the internals are. With over 100,000 miles, - it matters.

Full Synthetic is Good Stuff alright, but you may want to flush her first depending on the situation.

 

just keep using the motor craft synthetic blend. its cheap and actually lasted longer between changes than valvoline, quaker state, and mobil full synthetics i use to spend lots of money on.