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post #1 of 10 (permalink) Old 03-12-2013, 08:07 PM Thread Starter
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synthetic oil ?

Hey Guys, Ive got 95k on my 97 4.6 and I would like your opinion on changing to synthetic oils, my motor is stock
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post #2 of 10 (permalink) Old 03-12-2013, 08:13 PM
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I always run Motorcraft synthetic blend. Its what the manufacturer recommends.


1997 Thunderbird Sport
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destined to remain stock

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post #3 of 10 (permalink) Old 03-12-2013, 08:19 PM
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I did the synthetic switch right around your mileage too, when my car was stock. Nothing happend, lol. Worked as good as before.
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post #4 of 10 (permalink) Old 03-12-2013, 09:21 PM
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I only use synthetic motor oil in all of my vehicles.

-1996 Pearl White Thunderbird 4.6 Sport 4v with many mods:
Current Best: 13.583 @ 103.74 10/2014.
227hp/241tq measured on calibrated mustang dyno, tested at full vehicle simulation with inertia enabled, no number skewing.
-2001 White Ford F-250 Super Duty 6.8 V10, 4-door, 4x4, Limo Tint, BFG KO2's, Bilstein 7100 Remote Reservoir Race Bypass Shocks, 6" Spring lift, Kenwood Double Din, K&N Intake, FlowMaster Exhaust
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-2005 White GMC Sierra 3500 6.6 Duramax, Dually, 4-door, 4x4, Limo Tint, BFG Commercial T/A's, Rancho RS9000XL Shocks, Kenwood Double Din, K&N Intake, Banks Monster Exhaust
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post #5 of 10 (permalink) Old 03-12-2013, 09:56 PM
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And us "Carolina Crew" run Mobil One synthetic .(mostly I believe ) Some here trash the brand , but its been good to me and my engines .

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post #6 of 10 (permalink) Old 03-12-2013, 10:17 PM
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I used Royal Purple once at 80 something thousand miles and it drastically increased my oil consumption. No matter what oil I use now, I go though a quart every 600-700 miles. It used to only use one quart every 3000 miles. Right now, I use Shell rotella T6 5w40.

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post #7 of 10 (permalink) Old 03-12-2013, 10:52 PM
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I also use mobil 1 extended performance synthetic exclusively in my vehicles after seeing how clean it's been coming out and clean the insides of the motors are. It also stopped burning as much, and stopped leaking on my F-150.

Previously I've used AMSOIL, Royal Purple, Valvoline Synpower, standard synthetic Mobil 1, Castrol Syntec, Castrol Edge, Pennzoil Platinum, Redline, etc.

-1996 Pearl White Thunderbird 4.6 Sport 4v with many mods:
Current Best: 13.583 @ 103.74 10/2014.
227hp/241tq measured on calibrated mustang dyno, tested at full vehicle simulation with inertia enabled, no number skewing.
-2001 White Ford F-250 Super Duty 6.8 V10, 4-door, 4x4, Limo Tint, BFG KO2's, Bilstein 7100 Remote Reservoir Race Bypass Shocks, 6" Spring lift, Kenwood Double Din, K&N Intake, FlowMaster Exhaust
Amber_Murder's Daily Driver.
-2005 White GMC Sierra 3500 6.6 Duramax, Dually, 4-door, 4x4, Limo Tint, BFG Commercial T/A's, Rancho RS9000XL Shocks, Kenwood Double Din, K&N Intake, Banks Monster Exhaust
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post #8 of 10 (permalink) Old 03-12-2013, 11:12 PM Thread Starter
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Thanks everyone for the input, I might just give it a try
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post #9 of 10 (permalink) Old 03-13-2013, 06:03 PM
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my rule of thumb has always been if its over 150k or so, then the seals and things are worn to a point where its probably just the sludge holding the oil in. if you have leaks, like around your crank, then syn being mostly detergent will clean the sludge around those seals and they will leak worse.

same with valve seals, and i even experienced it on my own car. nearly 120k, went to mobil1 from who knows what (just bought her)... and she burned through 4 of the 6 quarts in less then 1k miles. i had to add more and a single quart of regular Valvoline to slow it down. and when i did that first oil change it was like someone had filled my pan with brown Dec-a-cake frosting. Quaker State?

after i did that initial mobil1 fill, i swapped to a synblend castrol, and it consumed considerably less, but was nowhere near cured. but over the next couple of oil changes i noticed it slowing, and even finally coming to a stop where i could fill it with 6 quarts, and still find 6 in it on the 4k oil change. and the sludgy diarrhea come drain time went away finally as well

so then i decided why the heck not, and i put mobil1 back in their, only around a quart every 6k! so anyway, long story short, sometimes you may have to ween it in with a blend, but if the motors too far gone, reseal it first and cross your fingers.

doesn't consume anything at all with a bit of Lucas syn oil treatment.

oh, and it also wiped out my O2's from all the oil consumption, and my cats have smelled like cat piss and rotten eggs ever since

RUST!! eating away at me more than the rear fender wells
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post #10 of 10 (permalink) Old 03-14-2013, 09:14 PM
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i would use a blend first then after the next change full synthetic. to make sure every thing will be good.
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