Slick 50

Matter of choice i suppose ,I think they are ok. Had an International T2670 semi 1980s and used Wynns in the gearbox and diff, 1,130,000ks i did and both were in it when i sold it.My Landcruiser G/box just just expired at 638,000ks with Nulon and or Wynns ,fonr diff can't coubt , it not used much but rear Diff was checked recently at 625,000 when i had a locker put in and they said crown wheel/pinion was fine.Now i guess it's up to you...it's your car.

We had a series of planetaries that were failing in our line of work and we tried nulon, wynns, pro ma, slick 50. Whilst they definently extended the life of the planetary gears and bearings by nearly double and cooled the oil from 130c back to 90c we found that Mobil Synthetic gear oils increased 10 fold + the life of these problem planetaries. But synthetic oil is fairly xxy.

I do not believe these products are worth the money. As the previous post said you are much better off with a quality oil.

Whilst most of these products will do what they say they do, many have harmful side affects also, such as reduced oil flow, seal and o-ring damage. My H/d Mechanical TAFE lecturer also worked for CAMS and did a lot of testing of these products and did not like them.

With regards to a diesel engine I would be very cautious about additives. The last thing you want is to glaze the bores.

I am in 2 minds about teflon type products. See how easy it is to scape the teflon from your frypan, then image that in you bore. Having said that, I added some to an old GS1000S motorcycle engine years ago and it seemed to bring the compresion up quite a bit (a much reduced overrun time in neutral).

I would only use these products as a last resort.

Steve M

Thanks to all that replyed, I also did a search on this topic in EO and found some interesting info.

I used to love slick 50, recently I read about a court case where an independant Gov agency in the US found they were liars and they got a massive fine for the claims they make. The problem arises when credible people say it has worked so well for them.

I reckon all oil additives are a waste of money and agree that some even cause damage rather than actually prevent it. e.g. The ones that claim to cure oil leaks work by making the oil seals swell up so instead of having maybe to replace one oil seal to fix an oil leak you then have to replace all of them which if you are talking an auto trans may involve an expensive rebuild. I have only ever used good quality reputable brand oils and greases and changed them at the recommended intervals or prior and have never had a eng/tans/diff problem or even a failed wheel bearing in 36 years of driving including a lot of high mileage outback stuff and rallying in my younger days. The fact many of these mobs that promote additives put key dealership personnel on incentives that include fully paid holidays to luxury destinations indicates to me that these products are overpriced and of suspect value if they have to do that to sell the stuff. Sure some of them might assist in the short term to keep something running that has a problem but as far as I am concerned there is only one way to correct a mechanical fault and that is the hard way. The other problem with these products it that they are a bit like vitamin pills. At the end of the day you never know what good they did anyway because whatever you are putting the additives in may have run just as long without them or conversly failed prematurely anyway if it was assembled incorrectly or had the wrong machining tolerances when manuafactured. The words that The General used to print in all Holden car manuals alwats sticks in my mind and that is "that the use of such products only serves to increase operating costs".

I put nulon g70 in my patrol gearbox and it made the gearchange worse. I reckon it stopped the syncro rings working as effectively.

I tried the nulon G70 too - it was schitte! Tried it in the mid 90's in a pintara gearbox to try and reduce noise. Looks like a milkshake in your gearbox after a drive - all frothed up, didn't like it at all. Go excellent quality oils,coolants,greases,filters etc and change regularly is my policy.

All the best

Greg

Where's Bill S? I'm sure he'll tell us that his product will improve all the above and so much more. lol.
Regards Andrew.

Oil additives are good when selling a car that is buggered. Ones that stop engine fuming and stops oil leaks are a temporay fix while you try to offload it.

In a good engine I use a good oil.