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Old 11-14-2010, 11:30 PM
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Oil Change Over

Anyone have any information on switching to synthetic oil...I have a 5.7 L with 70k miles and was thinking about switching over to synthetic...a buddy of mine said he switched over and blew his engine...anyone have that problem or have heard of it?
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Old 11-14-2010, 11:41 PM
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Re: Oil Change Over

With 70K on it.. I wouldn't switch.
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Old 11-15-2010, 01:20 AM
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Re: Oil Change Over

you can switch at anytime
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Old 11-15-2010, 02:56 AM
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Re: Oil Change Over

Never heard of any problems going to synthetic as long as engine is already broke in. @ 70k yer well broke in
Only problem I've heard of was adding some "slick" 50 to an old engine. They say it softens the seals so they push out & leak easily.
Any info on yer buds blown engine?
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Old 11-15-2010, 08:29 AM
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Re: Oil Change Over

I switched over at 130K with my 4.0L. You should be more than OK with your 70K engine
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Old 11-15-2010, 08:40 AM
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Re: Oil Change Over

you can switch at any time like others have said. some people suggest that the 1st oil change you use a synthetic blend then go full synthetic on the next change.
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Old 11-15-2010, 09:44 AM
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Re: Oil Change Over

Quote:
Originally Posted by 4.whoa View Post
Never heard of any problems going to synthetic as long as engine is already broke in. @ 70k yer well broke in
Only problem I've heard of was adding some "slick" 50 to an old engine. They say it softens the seals so they push out & leak easily.
Any info on yer buds blown engine?
It was on a 4.0. He said his engine and also some one else he knew with a 4.0 both blew up the engine causing piston slap. They both had about 150k on it when they did it
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Old 11-15-2010, 02:03 PM
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Re: Oil Change Over

Quote:
Originally Posted by wkjeepgirl86 View Post
It was on a 4.0. He said his engine and also some one else he knew with a 4.0 both blew up the engine causing piston slap. They both had about 150k on it when they did it
reread post 5
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Old 11-16-2010, 01:36 AM
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Re: Oil Change Over

Huh. I'm rebuilding a 4.0 now,@about 120k I laid it over wheeling and it ran on its side for a min or 2. @ about 140k(?) I ran synthetic without issue. @ 180k it started to knock a little. When apart I could see where the bearings were wore (I'm sure from running dry that time) but not much else. Maybe they were just putting thin stuff in an engine that was too worn and the thinner oil (most people seem to think they need to go thinner w/synthetic for some reason) just weeped out (shrug)
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Old 11-16-2010, 07:46 PM
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Re: Oil Change Over

Just did mine last week. O7 Overland 5.7 4x4 47k miles. Went w Mobile1 5-20 also used some chevron techron fuel system cleaner. Worked great! Less "tick" and seems to run smoother.
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Old 11-16-2010, 07:58 PM
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Re: Oil Change Over

Quote:
Originally Posted by wkjeepgirl86 View Post
Anyone have any information on switching to synthetic oil...I have a 5.7 L with 70k miles and was thinking about switching over to synthetic...a buddy of mine said he switched over and blew his engine...anyone have that problem or have heard of it?
I just changed to RP Synthetic and all 16 plugs, not bad but S _ _ _! it took 2 days ahhhhhh hahahahahahaha but i got it through.. I took it out for a little ride it did feel a little different yeah honestly i dont know if it's the synthetic or eng. not use to it, i felt it dragish i wanna say somethig like that LOL.. but i'll keep updating, wife drives to workOh! yeah i got 99k five seven hehehhehe
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Old 11-16-2010, 08:20 PM
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Re: Oil Change Over

I've changed cars over to synthetic at 91K, 62K, 116K, 110K, 39K, 36K, and 85K. lol in that order. it doesn't really matter when. just do the oil and the filter and you're all set. that's all that needs to be done.
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