Jeep Strokers

giving these 2 threads;
http://www.jeepstrokers.com/forum/viewtopic.php?t=733
http://www.jeepstrokers.com/forum/viewt ... f=24&t=330
excellent props and thanks-I wanted to throw in my $0.02 in light of the new PITA gov regs about zinc levels in oil.
Im a big M1 fan and was cruising their site and found some info. I also am into old 50's chevy trucks and the flat tappet oil chase is a big deal to us. especially with babbit bearings and no full oil pressure(dipper/splasher for main bearings!)

http://www.mobiloil.com/USA-English/Mot ... _Oil_FAQs4
"...Racing oils are formulated with anti-wear (Zinc/Phosphorus) chemistries at twice the level of automotive street oils to provide enhanced protection of highly loaded valve train systems found in some race engines. ..."

expensive!!!! $9/quart buy it here;
http://www.mobil1racingstore.com/buyracinglubes.html

this oil is full synthetic.

Amsoil also has several oils with high levels:

Joe Gibbs full synthetic XP6 = 5846 ppm zinc, phosophorous, and sulfer

Except Joe Gibbs doesn't recommend the XP oils for street use or extended drain intervals (in this case normals street oil change intervals). The XP series of oils is a race only oil. Not just because the high level of ZDDP, but also due to the lack of detergents. There is also no need for a 50 weight oil in our engines. Joe Gibbs sells their Hot Rod oil for our needs, not their XP oils.

Hmm.

Heavy metal levels that high (5000+ ppm) would toast up a catalyic converter REAL quick... Also, for a setup with reasonable spring rates, is unecessary... Just do your regular break in with that stuff and get back to "normal level ZDDP" oils... they usually have longer drain-life and are a helluva lot cheaper....

This discussion was about racing synthetic oils with high levels of Zinc, phosophorous, and so on. Now we are talking about catalytic converters? Ummmmmm.... Joe Gibbs doesn't "recommend" any of their oils for street use....they can't by law!

True enough.

In text, it looks like a good oil to me! Probably excels in its intended application.

lafrad wrote:Hmm.

Heavy metal levels that high (5000+ ppm) would toast up a catalyic converter REAL quick... Also, for a setup with reasonable spring rates, is unecessary... Just do your regular break in with that stuff and get back to "normal level ZDDP" oils... they usually have longer drain-life and are a helluva lot cheaper....

We are not talking about 'cats' I am not required to run one and dont. and for sure dont run one on my 1950's trucks... LOL

I really appreciate the info about amsoil-sorry i didnt have specs on teh M1, can you guys who posted amsoil and mentioned the Joe Gibbs hot rod oil-can you post links on where to buy and ballpark costs?

thanks for your input!

I used Brad Penn's SAE30 break-in oil for cam break in and 1st 600 miles, then switched to their 10w30 racing oil, which has ~1300ppm zddp. It costs about $50 for a case shipped to you. Oops--it's not a full syn(so many oil threads lately).

I get Joe Gibbs from http://www.hrpworld.com/ I tried to find it cheaper, but I usually end back there. I'm an Amsoil dealer, but you can always get it from their website. bobistheoilguy.com should have a VOA (virgin oil analysis) on their forum for the M1. I was actually on there last night and the Royal Purple XRP looks like a recent oil as well. Amsoil ARO also had a good analysis.

Besides cats the zddp will also damage O2 sensors, not that you are running one.

Edit: Found this for M1: http://www.mobiloil.com/USA-English/Mot ... _Guide.pdf