Help me decide! Full Syn or Semi Syn

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...wash every week, wax every month, 89 octane, vaccume interior & air filter every week, etc... etc.




Not trying to offend, but you need a girlfriend.
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...then you'd have so little money, you'd have to buy dino.




lol - I'll agree w/ the first line.
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@ the second line. Till then, I'm enjoying the freedom!
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OriginHacker21,
Have you drained that Dexcool yet? I would worry about that also.
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Haven't touched the coolant yet. I gotta do that and the spark plugs pretty soon. I guess the Power Steering fluid could use some changing too. Blah, how am I ever going to sleep tonight? Thanks ASL
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Buy some amsoil 0w30 change every 15000 to 20000 miles. There is more to life than changeing oil.




Right said Fred
lots more fun using good lubricant's than changing out dirty oil, Amsoil used with Amsoil air/oil filters will last 20thousand miles with no problems.
Amsoil= (PAO) Polyalphaolefin based lubricant's
Castrol Syntec formula= GroupIII crude oil (hydroisomerized)petrolium base stock
Mobil1= same groupIII base
most All Synthtics sold by Conventional oil companies= GroupIII base oil
and sell it to you for (PAO)lubricant prices
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See? Thats the question - "lots more fun using good lubricants" - How much more of a benefit is using say Amsoil 5w30 over Havoline 5w30 in a 5,000 mile oci? Is there a benefit? Seems like to me that the only benefit of Synthetics = longer OCI and higher heat tolerances in performance engines.
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My theory is this though. Take 2 engines: 2.2L Ecotec w/ dino and a 2.2L Ecotec engine w/ synthetic. If you throw a handfull of dirt in each - both engines will blow up or die. So, regardless of what oil you got in there the real issue is contaminents. So, cheap insurance & longevity for your vehicle = short OCI. So in my opinion and tastes I prefer a short OCI. In terms of synthetic vs conventional/dino - I don't see an advantage of using synthetic over conventional in a 5k oci in an economy (non-performance) engine.

This is the conclusion that I see in this thread. All/any comments welcome.


Edit: My thoughts are - Sure you may save some $$$ with synthetics but you run the risk of higher wear with contaminents over a short OCI with conventional oil. See what I mean?

So, if you have a good oil filter and no problem of contaminents synthetics would be saving $$$ due to a longer OCI.
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How much more of a benefit is using say Amsoil 5w30 over Havoline 5w30 in a 5,000 mile oci?




First,
What is your Primary Goal? Engine Cleanliness or 400,000 Miles?
Second,
Who keeps talking you into short OCI's?
 
Doesn't engine cleanliness = 400,000 miles? Well, at least engine wise. I think though that the priority would be engine cleanliness. 400k probably won't happen because the car will fall apart by then.

Short OCIs seem to make sense to me (described in my above post). 5,000 miles = short? I've always done short OCIs since I bought the car. I made it to 7,500 miles once with a good UOA on Castrol Syntec.

Are you suggesting that synthetic = cleaner engine?
 
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Are you suggesting that synthetic = cleaner engine?




Changing conventional oil at 4-5k your engine will be clean with no issues.

Now, make sure you do (I know you already know this.. But for the new people) maintanence on the PVC system, airfilters and such.

I've got almost 300k on a 1986 VW jetta which has seen fram filters and anything that was on sale oil. Mostly Valvoline and Havoline with Pennzoil and Qs thrown in. (and thats using alot of older spec'd oils like API SH and older)

Runs great and clean as can be.
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Had a 99 Taurus which was apart twice to the block in 108k miles. The valleys and heads looked like new. Nothing there. The car was a rent a car for it's first 21k miles (so you know its oil was changed with the best oil every 3k miles
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) and then I drove it and changed oil every 4-5k.

Don't worry about it.
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Change the oil every 4-5k and you'll be happy!
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Take care, bill
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Doesn't engine cleanliness = 400,000 miles?




In the summer of 2001, one of my co-worker's had a 1990 Jeep Cherokee. At had over 300,000 Miles on the clock. There was a good bit of varnish in the engine. The dipstick also looked nasty.
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I asked him when he changes the oil? He wasn't sure. He just tops it off with cheap dino.
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ASL - I think you are right. I believe, though, that with any oil (synthetic or not) if someone drives it too long they'll sludge up. Yes, Synthetic would last longer.

But for a 5k oci - (just got done reading BOBISTHEOILGUY'S DIFFERENT OILS AND NO OIL FILTER). Seems that a good conventional oil should perform similarly to a synthetic on 5k or less oci. yes?
 
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ASL - I think you are right. I believe, though, that with any oil (synthetic or not) if someone drives it too long they'll sludge up. Yes, Synthetic would last longer.

But for a 5k oci - (just got done reading BOBISTHEOILGUY'S DIFFERENT OILS AND NO OIL FILTER). Seems that a good conventional oil should perform similarly to a synthetic on 5k or less oci. yes?




I have plenty of well maintained engines here for inspection, all had quality API certified oils changed every 3/4 thousand miles and all have plenty of burnt certified oil around all the piston ring land area.
most all the engines I have, have caked on varnished
API certified oils still stuck to them that need to be cleaned off.
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I have used Amsoil for 7 years and never seen sludge even after 25thousand miles and upon engine inspection the parts looks as if it was polished and cleaned as new.
money not spent was money earned
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You want or like to change oil alot and live in Socal-
Chevron dino at 59 cents is the ticket. At least when you change early you won't be chucking $20 -35 blend or syn oil.
Then you'll have money for a cure or if the masterplan fails , ________ forbid, replacing the sunfire shy of 400k miles.
 
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In the summer of 2001, one of my co-worker's had a 1990 Jeep Cherokee. At had over 300,000 Miles on the clock. There was a good bit of varnish in the engine. The dipstick also looked nasty.
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I asked him when he changes the oil? He wasn't sure. He just tops it off with cheap dino.
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He HAS to have the Straight Six in there.
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Sootyoil,
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I have plenty of well maintained engines here for inspection, all had quality API certified oils changed every 3/4 thousand miles and all have plenty of burnt certified oil around all the piston ring land area.




Well, I not sure what to say to this. I know Synthetic oil does burn cleaner.
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Also flows better in the cold.
What really bothers me about Amsoil, is that I switched a high mileage car over to it. Amsoil said not to worry just go 25000miles/1yr on my first interval. I asked them over and over. The said not to worry. 11000miles later there was rust forming on the dipstick, oil consumption went though the roof. I now understand that the oil was dirty. I have been changing my Amsoil every 6000 miles with no troubles.
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I want the Mobil 1 and Amsoil you drain outta that car. I could justify a 5K OCI with that! After seeing what Dino looks like when cold, oiy-vey, I wannt dump out the Havoline and replace it quick! Your 3K syn will do the trick!
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