I have 67,800 miles on my 2000 4.0l. Will i have leak problems or any other problems with synthetic oil? I know i might need to do an engine flush or something but what can i do?

 

I don't think you'd need to do anything but remove the old oil and put the good stuff in....I didn't and everything is fine with mine.

 

how many miles did you have on yours? had any leaks at all?

 

I ran synthetic, you won't have any leak problems with it. I'd do an engine flush just to clean the motor out, its only a few bucks extra.

 

Just drain the old oil and let the plug sit out of it for an hour so everything drips out and put synthetic in. You won't have a problem. I've ran it in mine since 30,000.

 

sounds good
thanks

 

I first put synthetic in at about 57k, and I'm up near 70k now, just changed the oil yesterday. She runs just great!

 

sweet

 

As long as your truck hasn't been neglected when it comes to oil changes, you will be fine. Leaks that "develop" when people start using synthetic oil aren’t caused by the synthetic oil. They originally had a leak when they were using dino oil but because it builds up sludge if you don’t change it out as much as it needs to be, it stops the leak and the leak is never found. When you start running synthetic, because it has more cleaning agents (detergents), it gets rid of all that crap and lo and behold, you have a leak.

I changed the Marquis over to Mobil 1 at 40 some thousand miles and have 0 problems. I changed the Ranger over to Amsoil after the first 3 motorcraft oil changes (Only because the first 3 were free).

 

Synthetic oil will get thru crevices and leak better than conventional. That's cuz it's better at lubricating. At such low miles you shouldn't have any problems. I bought my truck at 59k. I put Maxlife in it for the first several changes then switched to Mobil 1, then one 10k run with Amsoil and now I'm back to Mobil 1. I don't see why you'd have a problem due to synthetic.

 

why didnt you keep the amsoil?

 

i talked to the previous owner and he said that he never let it go past 4,000 miles between a change so i should be ok right?
today i picked up 5qts of amsoil 5w-30 and a k&n oil filter

 

Yep, you should be just fine.

 

Run AMSOIL and you will be fine.. Like others have said, it may leak but this is only because all the crap is getting cleaned out. Did you pick up an engine flush that AMSOIL makes? I would recommand it! I noramly give it free with the AMSOIL Purchases from me. That way I know for sure you are getting all the old sludge out of your motor and the AMSOIL will have a good clean surface to adhere too.... Before dropping out that old oil I recommand that you get the engine flush from AMSOIL and run that though it, reguardless if you get it from me or the local store... you are going to want to make sure the motor is clean before dropping the AMSOIL in there!

 

I switched to a synthetic blend at 55k miles and I have a slight leak that developed at the front of the block. I figure a couple drips is small price to pay for the better oil. It doesn't leak enough for me to have to add any in between changes but I am afraid to switch to a full synthetic for that reason.

 

how much would the engine flush be from you shipped? im sorry i didnt get it from you but my dad insisted that i go ahead and get it today so i could get it done but i guess i should flush the engine out.

 

that happened with a synthetic blend?? because ive been using ford motorcraft for the whole time which is a synthetic blend and ive had no problems. what kind of oil are you using?

 

if i use synthetic and i dont like it, can i go back to a synthetic blend?

 

I switched from Dino oil around 55k miles to a Castrol Synthetic blend. I've always been happy with Castrol oils. I attributed the leak to how much thinner the oil was. I actually developed some lifter noise after the switch but itz most likely my truck

 

I'm not sure why you wouldn't like it but if you switch from full synthetic don't go back to conventional. A synthetic blend would be ok but I think you're worrying about this way too much...

I switched back to Mobil 1 after reading this: http://neptune.spacebears.com/cars/s.../oil-life.html
It's cheaper for better protection and doesn't thicken up....it may not be a perfect test, but it's good enough for me....the other plus is I can buy this oil in many stores including my favorite, Wal-Mart.

 

ya i always seem to blow everything out of proportion

 

If you don't hurry up and do it I will drive to VA and do it for you while you attempt to sleep, but can't since you're tossing and turning wondering if we'll ever run out of air to breathe. Make the change. Don't make me tell you again :)

 

alright alright dont get fiesty on me, lol. im just funny about that darn truck but im goin out to do the oil now.
thanks for all your help

 

After you use a synthetic lube, you can switch back to synthetic-blend or 100% dino with no problems at any time. I have no idea why someone would want to switch back to dino oil after using synthetic though...

 

im using synpower full synthetic in my truck...
love it