Synthetic Fluids Recommended?

[shovelbill]

I always thought it was pure Dino oil. Anyway, the point most are missing here is the base stock from which the oil is made. Group 5 are the "real" synthetics, the ones that make a high mileage engine leak. Most synthetics these days use group 3 and group 4 base stocks. Group 3 is what Dino oil is made from. The word synthetic now is mostly a marketing term since some judge granted petroleum companies the ability to use the word on anything refined enough. Group 5 is tough to find, and you won't find it at Walmart or most parts store shelves. Amsoil and Redline are 2 that come to mind who actually make a true group 5 synthetic. Castrol, Mobil 1, and Royal Purple are not.

like the Harley Syn3 crap....it's polymer base is dino....i always wondered how they can put 100% synthetic on the bottle.....Spectro is another good quality synthetic......i believe they have the group 5 offerings.....as does Belray.

i only run 25W60 Spectro in my hot rod shovelhead.....that's all she seems to like, LOL

 

[drewcrew]

like the Harley Syn3 crap....it's polymer base is dino....i always wondered how they can put 100% synthetic on the bottle.....Spectro is another good quality synthetic......i believe they have the group 5 offerings.....as does Belray.

i only run 25W60 Spectro in my hot rod shovelhead.....that's all she seems to like, LOL

I'm still in a fog trying to figure out all the posts about headlights and now this. I hope nobody starts a thread about windshield washer fluid. That would put me over the edge.

 

[michael hurd]

Oil base stocks defined, also what is legally defined as 'synthetic'.

https://www.pca.org/news/2015-11-02/synthetic-word-relates-motor-oil

 

[shovelbill]

I'm still in a fog trying to figure out all the posts about headlights and now this. I hope nobody starts a thread about windshield washer fluid. That would put me over the edge.

howzaboot muffler bearings and winter air for the tires?

i just bought some new fangled "RainX" washer fluid...it's ORANGE and is supposed to have some **** in to help keep the rain beading and bug goo off....some kinda fluid with kung-fu-grip ! LMAO.......i know that made you chuckle

 

[TylerZ281500]

usuaslly when they say 100% synthetic and its not they get by with saying it because of the synthetic additives they put in there they are 100% synthetic, which seems redundant and stupid, but, as someone said some judge granted everyone ability to claim it as long as there some in there, so they use it willy nilly, its preference to most and knowledge to others, royal purple will always be deemed special to people. for me i use redline joe gibbs or bradd pen in everything, if i need an over the counter fix then pennzoil platinum. oil filters i stick with amsoil or wix. and even though transfluids are no different or power steering or anything i hit up my amsoil dealer for that stuff.

 

[Supercharged111]

howzaboot muffler bearings and winter air for the tires?

i just bought some new fangled "RainX" washer fluid...it's ORANGE and is supposed to have some **** in to help keep the rain beading and bug goo off....some kinda fluid with kung-fu-grip ! LMAO.......i know that made you chuckle

It's far from new, I've been using it exclusively for years now. If it starts to rain, just give your windshield a squirt and the rain will bead up and blow off the top of your windshield.

 

[drewcrew]

howzaboot muffler bearings and winter air for the tires?

i just bought some new fangled "RainX" washer fluid...it's ORANGE and is supposed to have some **** in to help keep the rain beading and bug goo off....some kinda fluid with kung-fu-grip ! LMAO.......i know that made you chuckle

Muffler bearings are new and I got the winter air in the tires. All I need to do now is change the water in the battery to synthetic water. Should I change the battery filter too ?

 

[shovelbill]

It's far from new, I've been using it exclusively for years now. If it starts to rain, just give your windshield a squirt and the rain will bead up and blow off the top of your windshield.

good to know, thanks....got 2 gallons for $7 too.

 

[shovelbill]

It's far from new, I've been using it exclusively for years now. If it starts to rain, just give your windshield a squirt and the rain will bead up and blow off the top of your windshield.

i do use the RainX on my windshield...and the "fog" proof stuff inside too.......i like to see. at 70+ mph in reasonable rain i don't need my wipers, especially at night.

 

[redfishsc]

Right from Eaton ( FAQ under the Eaton Posi section )

http://www.eaton.com/Eaton/ProductsServices/Vehicle/Differentials/FAQforDifferentials/

Q: What kind of oil should I use? Can I use synthetics? Do I need a friction additive/modifier?
A: Eaton Posi units perform best when using GL4 (or better) mineral/petroleum based gear oil. A four ounce bottle of friction additive/modifier is also necessary for optimum performance.

Q: Is the Eaton Posi Rebuildable?
A: Yes. There are three main types of service kits available - internal spider and axle gear kits, clutch kits, and preload spring & plate kits.

Q: Can I upgrade my Eaton Posi?
A: Yes. Both the clutch disks and the preload springs can be upgraded for extreme off road and drag racing applications. Posi units come equipped with 400lb of preload. They can be upgraded to 800lb, or even downgraded to 300 or 200lbs options. Clutches - There are several types of clutch service kits. They range from the OE, 18 disc (standard), the 24 disc (high performance), and the modern day, high tech 14 disc carbon fiber design.

Q: What is the warranty for the Eaton Posi?
A: The Eaton Posi is guaranteed for one year against manufacturers defects.

So far as I know, this doesn't apply to GM stock rear ends.

I cannot speak to his year model (88) but I'm almost certain you either got a G80 Locker (not a posi) or an open diff (not a posi). You can most definitely run synthetic in either a G80 or open diff, no problem, and probably handles heat a lot better.


A few months ago I pulled the old G80 out of my Suburban and put a Detroit (Eaton) Truetrac in, and the instructions included said basically the same as above. The Truetrac is a posi, except it uses torsion gears/pinions for friction. I'd rather run synth but I've read enough stories that the Truetrac doesn't like synth at all.