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Old 06-03-2009, 17:24   #1 (permalink)
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Synthetic oil question

I have a '95 F-150 5.0L with 80,000 miles. I have always used Quaker State 10W-30 oil. I am thinking about changing to a synthetic oil. Should I have any concerns with changing at this point? Anything special I should do, or just change the oil as always? One more question...what type of synthetic oil would you reccomend? Thanks.
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Old 06-03-2009, 18:13   #2 (permalink)
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Re: Synthetic oil question

I say go ahead and change to synthetic won't hurt nothing if anything it will help better perfomance gas mileage don't get me wrong but it won't be a great increase but will help.
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Old 06-03-2009, 18:16   #3 (permalink)
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Re: Synthetic oil question

Some like Mobile 1, some like Amsoil....Me, I like Mobile 1 because it's not a PITA to find...
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Old 06-03-2009, 21:49   #4 (permalink)
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Re: Synthetic oil question

Changing to syn. can trigger temporary oil leaks, especially at the F&R main seals, until the seals become conditioned to the new oil. So check the level FREQUENTLY after changing, and top-up as needed. I didn't on my '94 CV, and the engine seized at 70mph ~1,000 miles after I changed. That's why it has a '00 engine now.

But on these old smallblocks, you won't see enough improvement to justify the cost of synthetic oil (which typically contains NO synthetic oil anyway). IMO, that money would be better spent on a good professional engine flush (I recommend BG products), or intake system cleaning (again, the BG 3-part process). Call a few local shops to find out which ones use BG products.

If you want to read more about why "full 100% synthetic oil" is made of 100% dino oil, check BITOG Welcome .
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Old 06-04-2009, 16:56   #5 (permalink)
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Re: Synthetic oil question

Very good info. Thank you all.
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Old 06-14-2009, 14:23   #6 (permalink)
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Re: Synthetic oil question

I haven't had any problems changing to synthetic oils. I've been running Amsoil products in all my vehicles for the near part of a decade. I change the oil once a year and for $15 mid year I send a 1/4oz sample out for analysis and it tells me I don't have to change it for another year on top of the 6/7 months I already drove on it. My work SUV has always ate a bit of oil, about half a quart every 3000miles, and now with running synthetic I only need to add a quart every 7000miles, so consumption has dropped slightly; and it tows 4-6K every weekend.

If you like changing the oil regularly, I'd stick with the non synthetic stuff. I changed reg oil in my old 2.5L I4 3speed Dodge Spirit every 2500miles and the engine still ran strong with over 260K on it. If the frame didn't rot through I'm sure it'd still be running now. I find you can go farther with your money using synthetic oil due to the increased drain intervals. I know a few folks who still change it every 3-4K, but it's a waste of money then. What brand or grade you want to use ultimately comes down to personal preference.

Quaker State is a good oil, but here they want almost $5 for a quart of QS 5W30 non-synthetic! For double the price I can get Amsoil Synthetic and drive 20K/yr on it. Best part is that it's still golden brown at 9K of driving, where as reg oil turns black on me at the 3K mark in all my vehicles.
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Old 06-16-2009, 05:01   #7 (permalink)
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Re: Synthetic oil question

Nothing but Amsoil but I have a couple of sources locally. I also use something called AutoRx. It's a fantastic cleaner for anything but fuel. Go to their website and check it out. It's nice having everything as clean as the day you bought it. I also quit using Fram filters when I saw some cut open and switched to Wix. I have one for the trans and the other for the engine. Both are remotely mounted on the front frame rails and are a lot easier to change now.
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Old 06-16-2009, 12:15   #8 (permalink)
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Re: Synthetic oil question

Quote:
Originally Posted by kaboom10 View Post
I also use something called AutoRx. It's a fantastic cleaner for anything but fuel. Go to their website and check it out.
I bought some with a group deal on another site three years ago. I have two bottles left, out of six. I ran it mostly on my older Dodge's. The engine was superbly clean even with 268K on the odo. The only downside to that car was that I had to spend a day every year and a half changing out the head gasket. I never did put any AutoRX in my Taurus. The engine is still clean from what I can tell, as far as changing out plugs and such. I've been running synthetic in it since I bought it.
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Old 06-16-2009, 13:39   #9 (permalink)
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Re: Synthetic oil question

Quote:
Originally Posted by 360ci View Post
I bought some with a group deal on another site three years ago. I have two bottles left, out of six. I ran it mostly on my older Dodge's. The engine was superbly clean even with 268K on the odo. The only downside to that car was that I had to spend a day every year and a half changing out the head gasket. I never did put any AutoRX in my Taurus. The engine is still clean from what I can tell, as far as changing out plugs and such. I've been running synthetic in it since I bought it.
Head gaskets became something almost impossible to replace once asbestos was outlawed. I worked for McCord and each engine combination and design called for a different product to be used. I'm still not sure if they've come up with a total solution. Wife and I got good at keeping her old Camaro from leaking due to the gaskets. The race engines were ez since they got tore down frequently.

I use a synthetic from after break in to. I just thought I would try Arx to see what it could do. I still run a maintenance dose every OC. Engine sees some lazy days now that school is out.
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Old 06-16-2009, 17:33   #10 (permalink)
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Re: Synthetic oil question

I ordered head gaskets by the half dozen for my older Spirit cars, since I owned two. I think I still have one in the garage somewhere! The spring of '07, I ordered a gasket for my old boat (5.7L Merc/GM) online since they were hard to find locally. Anyway, the idiots that mailed it, folded the gaskets in half so they could save on packaging! Ugh. Took me another three weeks before I got a replacement set - that weren't folded over!

Along with AutoRX, there's a product in a can (yes a can), called Restore. A few friends of mine have used it on vehicles in the past for years, and swear by it to boost compression back up toward OE levels. Still, the Restore looks like a thickened engine oil. At least it's a lot less than AutoRX, but at least I can say that ARX works better than a lot of engine cleaners I've tried, including the Amsoil one.
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