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Since I will be driving my M712 600 miles to its new home its been suggested to use a lead replacement in the fuel - which ones the best? Someone suggested Marvel Mystery Oil as a top end lube.

I use a product called CD-2. I buy it at the local Wal-Mart for around 5 bucks a bottle. Each bottle does 160 gallons. I use it every other tank. Some say you need it and some say you dont. For me it is too cheap to risk it. With 87 octane my truck gets a ping. I try and use 93 octane fuel and the truck does not ping. I believe that they make a version that has an octane booster built in (to run 87 octane) but I have never found any for sale. Good luck with the trip home. Are you running I-10 or going to stay on the smaller highways?

Howdy,
Drove my 710K home 1700 miles, no additive. Has run like a champ ever since. Just like new...
Have driven it on several 300 mile (600 miles round trip) trips with no additive and no troubles there either.
So, mark me down in the "don't need it" camp...

I've been using CD-2 as well, easy to get and use. I vary the amount based on the condition I will be driving in, generally I use half a dose so I can store two bottles in my road kit and treat 25 -30 tankfulls. On a side note I also use Sta-Bil fuel stabilizer for the gas in my spare tanks, also available from wally-world.

The debate will always continue on this subject, who knows if you need it or not, but at $5.00 for 8 tankfulls I'd rather not take the chance.

Miles

We will be taking the "back way" I-10 then 20 - 98 - 19 south. Lower speed limits less traffic.

You can get tetraethyl lead at www.maxlead2000.com I use it. Does it help? I dunno. 93 octane certainly helps.

I have been using 87 oct. gas and notice a little dieseling at shutdown, only 1 or 2 chugs, is this from not using leaded gas? If so what else am I going to notice over time, valve burn? I dont want to sacrafice the engine to save?? a little change at the pump, should I be using the addative too?

Morris, 710M

Mine runs noticeably better on 93 octane than it does on 87. At $3 a gallon the .10 or .20 difference seems less important than it did when gas was cheaper. There was a long thread on the old forum about whether or not to use lead. I think the bottom line was that it was a good idea especially when running consistently high rpm for long periods of time like highway driving.

I've never seen any discussion comparing tetraethyl lead to lead substitutes. I use the real thing.

Any ideas where to get the lead additive in Northern CA? Kragen? Some other auto parts store maybe?

Finally picked up the CD-2 at walmart - Like the way it is despensed - simple.

Most easily available additives are "lead replacements" and don't contain lead. I wonder if they are not just octane boosters. Anybody know for sure? If so, they would not perform the protective fuctions tetraethyllead does.

I am surprised that Jim L. has not chimed in on this thread. We both did the cd2 thing for awhile. But after pulling my heads we decided it was a waste of money. The only advantage to lead additive is that some think the valve seats are not "hardened".

Save your money, (just my 25 cents, damm inflation)