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MG MGB GT V8 Factory Originals Technical - 'Slick' type products

Do these after market luberication enhances really work for engins, gearbox and backaxles? Do they help with the Rover SD1 box in particular!
Thanks for any opinions.
Richard E

Check the archives on this. Loads of expert opinions - General consensus is "stay away" as modern oils have everything they need... From a man who always used Slick 50.

Better putting the money to changing fluids more often
Stuart Robson

BTW Do use use ATF in the SD1 Box?
Stuart Robson


Avoid see long post.

This is the transcript of an AA article published in Motor May 10th 1986.

The widely-advertised oil additive Slick 50 has been soundly slammed by the AA

What is a UCL?
Jim Blackwood


It took me a while, but I worked it out!

Upper cylinder lubricants!

Ian Buckley


Please read:-

which deals with lubrication of the LT77 gearbox and the R380.

In summary for the LT77 Castrol TQF Auto Trans Fluid or other makers equivalent and in the R380 Castrol Dextron II or Dextron III or other makers equivalent in the earlier boxes and Texaco MTF94 (or possibly Castrol SMX-S) in the later (post August 1988) R380's.

My view would be to avoid any other lubricants, or additives like the plague.


Nigel J S Steward


I have used various oils in LT77 boxes and offer the following comments based on my limited experience.

EP80/90 hypoid Oils.
Never noticed the heavy shift reported elsewhere but have broken oil pumps. NOT Recommended because of pump failures.

ATF Type F.
Poor synchro performance and excessive wear of gear selector forks. NOT Recommended.

ATF Type Dextron II.
Good synchro performance and good wear performance. Recommended.

Are you having particular problems with the LT77 gearbox?

Dave Brooke

This is my personal opinion on additives.

Manufactures spend lots of $$$testing different lubricants and filters, with the result of this test they write the manuals with specific recommendations on different driving conditions, etc. I personally do not use any additives and use the recommneded oil by the manufacturer on all of my vehicles.
If Fram filters were as good they say they are, then GM, Ford etc. would use them, but they don't.
Use what the manufacturer recommends and save your $$$

The only additive that is endorse by GM is a break in oil additive for rebuild engines and their Posi traction oil additive which they both are sold with the GM Logo.
Additives in my opinion is a waste of money.
Short story:
Two spec race cars, same engine, trans, tires etc.
Lubricants are not covered in the rules. One car was using an oil additive, the other synmtetic oil only, 5 races later the car with the oil additive engine fail, the other went to finish the season. End of story.
Bill Guzman

Many years ago I was privileged to work for Mobil Oil in a training program, & attended a number of lectures & seminars. One of these delt with additives. Long before Slick50, additives were a serious problem for consumers & oil companies alike. A senior research scientist talked about the exhaustive research that went into the additive package for various Mobil Oil products & flatly stated that none of the additivies available were beneficial & most were harmful. I doubt if anything has changed.

All major oil companies spend huge amounts of money developing & TESTING the additives used in their oils & gasoline. They spend all this money to obtain or maintain a competitive advantage. It is hard to believe that someone has made a discovery in their basement workshop & tested it & found it superior to the products used by a major oil company.

Jim Stuart

OK chaps I have slapped my wrists for even thinking about it! Many thanks for the feedback.
Dave Brooke- not rearly having problems with LT77, just a little notchy at times, when cold, (car that is) thinking about it.
Thanks again
Richard E


Notchy shift when cold is a commonly reported problem with the normal recommended cure being to run ATF or MTF.

If thats the only problem your doing alright!

As far as I can find out the original 1970's LT77 spec said use ep90 type oil but this was changed to ATF in the early 1980's.

As Nigel wrote the Dextron II or III ATF seems to be the current normal recommendation for the LT77.

Interestingly, it is also the recommended lubricant for BW/Tremec T5 family of gearboxes.


Dave Brooke

This thread was discussed between 13/09/2004 and 16/09/2004

MG MGB GT V8 Factory Originals Technical index

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