Synthetic or Regular Differential Oil - The 1947 - Present Chevrolet & GMC Truck Message Board Network

ubtripn · 07-19-2011, 08:33 AM

Is it ok to put Synthetic in my differential after it has been running fossel based, regular oil for so may years? I heard it will looseen seals, cause leaks, etc.. if you switch midway through with any engine.

**70cst** · 07-19-2011, 09:25 AM

Some reading for you ...

fluids/oils/gear lube
http://67-72chevytrucks.com/vboard/s...d.php?t=177957

someone please tell me this guy is full of BS
http://67-72chevytrucks.com/vboard/s...d.php?t=378304

ubtripn · 07-19-2011, 09:26 AM

Thanks

**70cst** · 07-19-2011, 09:30 AM

Quote:

Originally Posted by ubtripn

Thanks

Glad to help. I try and do one good deed a month

Longhorn Man · 07-19-2011, 09:42 AM

synthetc oil is the best thing you can do for your diff.

cdowns · 07-19-2011, 09:56 AM

i use synthetic lubrication in everything motor tranny rearend and also wheel bearings// have had noticable increase in milage and slightly more performance in my real world test uses

the last two new GM vehicles i got came with synthetic right from the GMfactory//2004silverado and 2008 HHRss

**Stocker** · 07-19-2011, 10:13 AM

Quote:

Originally Posted by ubtripn

Is it ok to put Synthetic in my differential after it has been running fossel based, regular oil for so may years? I heard it will looseen seals, cause leaks, etc..

My K20 had dino in the diffs (& t-case) for close to three decades before I changed to synthetic. No problems....

ubtripn · 07-21-2011, 03:12 PM

Right on, synthetic it is. Thanks!

GASoline71 · 07-21-2011, 03:31 PM

Unless it has a positraction rearend. Some Synth oils aren't compatible with a positraction diff. Or the other way around...

Gary

cdowns · 07-21-2011, 03:35 PM

Quote:

Originally Posted by GASoline71

Unless it has a positraction rearend. Some Synth oils aren't compatible with a positraction diff. Or the other way around...

Gary

most all synthetic i know of is no problem in posi rears in fact most you dont even need a posi additive like you do with dinogrease

Longhorn Man · 07-21-2011, 08:16 PM

yeah... I've never heard of that one. Sounds like yet another one of the millions of myths about synthetic oils.

oldblue1968chevy · 07-21-2011, 09:27 PM

great my parts guy told me synthetic is a fluke and i put dino in my diff lol

chevytruckluver · 07-21-2011, 10:50 PM

I am running Redline Heavy Shockproof in my rear, its a posi and did not do the additve as directed by the shop that built the rear. The owner told me he tested diffrent brands at the track and the Redline proved to run cooler thus working better to reduce friction

07-19-2011, 08:33 AM	#1
ubtripn Registered User Join Date: Apr 2010 Location: Boise, ID Posts: 1,280	Synthetic or Regular Differential Oil Is it ok to put Synthetic in my differential after it has been running fossel based, regular oil for so may years? I heard it will looseen seals, cause leaks, etc.. if you switch midway through with any engine.

07-19-2011, 09:25 AM	#2
70cst Senior Member Join Date: Feb 2001 Location: New Madison, Ohio Posts: 21,373	Re: Synthetic or Regular Differential Oil Some reading for you ... fluids/oils/gear lube http://67-72chevytrucks.com/vboard/s...d.php?t=177957 someone please tell me this guy is full of BS http://67-72chevytrucks.com/vboard/s...d.php?t=378304 __________________ A husband can be right...or...A husband can be happy. 67-72 Chevy and GMC Trucks...The Classic Truck for the Classic Folk. 1970 CST Two tone green, 402BB, 400 Automatic, Tach, Buckets, AC, AM-FM, Tilt, GM CB, GM 8 Tract, LWB, etc JOHN 17:3...The better side of "LIFE" Remember: Everyday is a good day...Some are just gooder!

07-19-2011, 09:26 AM	#3
ubtripn Registered User Join Date: Apr 2010 Location: Boise, ID Posts: 1,280	Re: Synthetic or Regular Differential Oil Thanks

07-19-2011, 09:42 AM	#5
Longhorn Man its all about the +6 inches Join Date: Jan 2001 Location: Hilliard Ohio Posts: 2,690	Re: Synthetic or Regular Differential Oil synthetc oil is the best thing you can do for your diff.

07-19-2011, 09:56 AM	#6
cdowns Senior Member Join Date: Jan 2003 Location: daytonabeach Posts: 22,956	Re: Synthetic or Regular Differential Oil i use synthetic lubrication in everything motor tranny rearend and also wheel bearings// have had noticable increase in milage and slightly more performance in my real world test uses the last two new GM vehicles i got came with synthetic right from the GMfactory//2004silverado and 2008 HHRss __________________ 71c-10 350/2004r/4:11 lowered3/4 longbed/dead by hurricane MEANING OF DEATH::::: SOMEBODY ELSE GETS YOUR STUFF DONT BELIEVE EVERYTHING YOU THINK TAKE MY ADVISE;I DON'T USE IT ANYWAY

07-21-2011, 03:12 PM	#8
ubtripn Registered User Join Date: Apr 2010 Location: Boise, ID Posts: 1,280	Re: Synthetic or Regular Differential Oil Right on, synthetic it is. Thanks!

07-21-2011, 08:16 PM	#11
Longhorn Man its all about the +6 inches Join Date: Jan 2001 Location: Hilliard Ohio Posts: 2,690	Re: Synthetic or Regular Differential Oil yeah... I've never heard of that one. Sounds like yet another one of the millions of myths about synthetic oils.

07-21-2011, 09:27 PM	#12
oldblue1968chevy Grandpa in the rustmobile... Join Date: Nov 2008 Location: Spokane WA/Viola TN Posts: 11,422	Re: Synthetic or Regular Differential Oil great my parts guy told me synthetic is a fluke and i put dino in my diff lol __________________ John Goose-1968 C10 355,9.32-1CR, Vortec Heads ,262 voodoo, 3.73:1 3OTT (HS ride/beater/farm truck) http://67-72chevytrucks.com/vboard/s...d.php?t=317684 Grams 53-1953 Chevrolet Belair http://67-72chevytrucks.com/vboard/s...=1#post4327784 1969 Chevy C10 Shortbed 4.5/6?" Frame off resto http://67-72chevytrucks.com/vboard/s...d.php?t=548136 1999 Toyota Tacoma 4x4

07-21-2011, 10:50 PM	#13
chevytruckluver Eat, Sleep, Drive a Chevy Join Date: Apr 2010 Location: the town of the cow, Texas Posts: 1,152	Re: Synthetic or Regular Differential Oil I am running Redline Heavy Shockproof in my rear, its a posi and did not do the additve as directed by the shop that built the rear. The owner told me he tested diffrent brands at the track and the Redline proved to run cooler thus working better to reduce friction __________________ Trey Silence may be Golden, but Duct Tape is Silver! 72 Short Step 57 "big window" short step



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