I am very skeptical of PTFE coating in engine applications, and would have to see specifics to even consider it. I know that many companies coat piston skirts with moly, but that is entirely different. PTFE is used for dry lubricant qualities in open gears, and in aerospace for areas where dry film lubrication is needed (such as the arm on the Space Shuttle). I have already posted on why PTFE seems a bad idea in liquid lubricated parts: it is chemically inert, it would work against additives in oil, it is unstable at temps over 450deg, it forms volatile and poisonous compounds when heated, it tends to migrate, etc. etc. Moly is heat stable, has a much higher film strength that PTFE, etc. It has been used as an adjunct in lubricating oils for years. I doubt any racers use PTFE coatings where there is high heat, or where the primary lubricant is an engine or gear oil - PTFE actually resists oil, so it might be useful in areas where you do not want oil accumulation acting as a parasitic drag, int he same way oil windage is avoided to keep splashed oil off the crank. But if this is leading to a general endorsement of PTFE as a lubricant for gears, I don't buy it.

Again, a link. But didn't AJ Foyt, Al Unser, and others humiliate themselves by endorsing some of the snake oils?? May be deja vu.

Again, a link where there is some science involved would be helpful, or this is just another "open" thread - I will search on topic, but doubt anything will come up.

********************************************

OK, here are the links that came up when i searched on "PTFE engine coatings". They support everything I posted above - they did indicate that PTFE might be beneficial in low load, low heat areas such as valve springs or con-rods, where the parasitic effects of oil want to be reduced in racing.

http://www.hpcoatings.com/engine_coatings.htm
http://www.grc.nasa.gov/WWW/epbranch/coating/tfabs.htm
http://www.opcracing.com/page4.html

 

RR,
So, possibly a silly question. If it is I apologise. I live in Texas where it seldome gets cold (mostly 75-110 ambient temp). Is the 607 a prefrence or do you think it's necessary to maintain the diff. The local dealership uses pensoil GL-5 and one of the local pro shops (MZM) uses Valvoline GL-5. Are these bad products or just not as good a product as the 607? I am not an engineer, so I'm going by people like you who have done the research. I contacted LE and can get a case of 607 for about $216. Would you suggest it for the transmission or is there a different oil? Your opinion matters more than some inept dealership monkey.

Cotton

 

Re: LE 607
U might want to post that - think Quaker State would do that?


quote:
--------------------------------------------------------------------------------

s2 kwicksilver wrote on 03-10-04 10:38AM:
I just got off of the phone with LE. -----Amazing,------there rep is bringing me a free quart of LE 607 on Monday--------YEA!!!!
He told me I had to buy in case lots,when I explained i only needed a couple qts he said he would give me a quart.
rick

 

http://www.mag-hytec.com/LE_SAE_90.htm You can buy it here!!!Maybe they will ship it out to you. You'll have to call them you can't order it on there web site.

 

[QUOTE]Originally posted by cottoncb
RR,

 

[QUOTE]Originally posted by exceltoexcel
http://www.mag-hytec.com/LE_SAE_90.htm

 

Thank you. That answered the quesation that I had. When the time comes, and I sure it will; I will purchase the LE 607 and use it for the diff per your recomendation. You clarity and candor is appreciated. I will consult the manual for frequency of changes.

Cotton

 

The manual suggests a 30K service interval. Considering the high failure rate of our diff, I would at least do the 1st change REALLY early.

 

Thank you gernby, I just bought this 2001 about 2 weeks ago and it has 20k on it. Belonged to a doctor who spun it into a ditch on bad rears in the rain. He traded it in on a Pilot. My buddy at the dealership called me up and told me to come get it. $19,200. I thought it was reasonable so I did. I think I will do the diff after I catch up on money. Insurance ($600/6mth) along with the cost of going to get it and ($734)in new s03's tapped me this month. Thank you everyone again for your help.

 

(awaking from sleep)
is mobil 1 good?
im sorry i have a lil bit of ADD