jonw440 187 #1 Posted January 17, 2022 (edited) 1993 314-8 with 356hrs+ (as hour meter is broken) This fall I added some Seafoam and Marvel Mystery oil to the gas tank per instructions. I have not used the tractor until 3 weeks ago and noticed on start up there was more smoke at start up then usual. I am hoping its just the carbon burning off as I have NOT removed the head to decarboned the head or piston. It runs great but what would be my next step? Edited January 17, 2022 by jonw440 3 Share this post Link to post Share on other sites
SylvanLakeWH 25,557 #2 Posted January 17, 2022 (edited) It’s gonna smoke a bit if you put MMO in the gas… especially on first start if it sat… Does it clear up and run normal when warmed up without a lot of smoke? Edited January 17, 2022 by SylvanLakeWH 4 2 Share this post Link to post Share on other sites
Snoopy11 5,714 #3 Posted January 17, 2022 Ready... set... go... What is the color of the smoke.? What is your oil level? What type/weight of oil are you using? Does it smoke just at startup or at any other time? After engine is warm, if you shut down engine and start it back up, does it smoke? May be a bit of carbon on the cylinder wall/piston... and the treatments you used actually cleaned all of it off, leading to more smoke. May we have pictures or video of the smoke? Don 2 Share this post Link to post Share on other sites
Snoopy11 5,714 #4 Posted January 17, 2022 Just now, SylvanLakeWH said: It’s gonna smoke a bit if you put MMO in the gas… Color of smoke is important though... and does the fuel tank still have some treatment in it? Don 1 Share this post Link to post Share on other sites
953 nut 55,228 #5 Posted January 17, 2022 I have never used MMO in the gas tank but SeaFoam is the best fuel additive in my opinion. 5 2 Share this post Link to post Share on other sites
Snoopy11 5,714 #6 Posted January 17, 2022 2 minutes ago, 953 nut said: I have never used MMO in the gas tank but SeaFoam is the best fuel additive in my opinion. If I remember correctly, SeaFoam smoke is whitish... And again, I wonder if some is still in the fuel tank. Don 1 Share this post Link to post Share on other sites
Achto 27,571 #7 Posted January 17, 2022 3 minutes ago, Snoopy11 said: SeaFoam smoke is whitish. I add 1oz SeaFoam to every gallon of gas that I use in my small engines. All the time. No smoke from SeaFoam, MMO will cause some smoke. 5 Share this post Link to post Share on other sites
jonw440 187 #8 Posted January 17, 2022 Thanks guys. Yes it is white smoke at startup. Does NOT smoke once it's running. 4 Share this post Link to post Share on other sites
jonw440 187 #9 Posted January 17, 2022 18 minutes ago, Snoopy11 said: Color of smoke is important though... and does the fuel tank still have some treatment in it? Don Yes 2 Share this post Link to post Share on other sites
kpinnc 12,028 #10 Posted January 17, 2022 (edited) Seafoam will definitely make smoke, but only if you put a lot in the fuel. MMO will smoke no matter how much is there. Finish out the tank and see what happens with clean fuel. Use ethanol free if you can. Edited January 17, 2022 by kpinnc 4 Share this post Link to post Share on other sites
jonw440 187 #11 Posted January 17, 2022 20 minutes ago, Snoopy11 said: Ready... set... go... What is the color of the smoke.? WHITE What is your oil level? FULL What type/weight of oil are you using? 10/30 Does it smoke just at startup or at any other time? Just at start up After engine is warm, if you shut down engine and start it back up, does it smoke? Didnt try May be a bit of carbon on the cylinder wall/piston... and the treatments you used actually cleaned all of it off, leading to more smoke. May we have pictures or video of the smoke? Will do tomorrow Don 1 Share this post Link to post Share on other sites
peter lena 8,627 #12 Posted January 17, 2022 @jonw440 cold temperature and a fast idle will also smoke , till the oil starts to warm , but having mmo in your gas will definitely smoke. I use stabil in all my fuels , with zero smoke .pete 2 1 Share this post Link to post Share on other sites
SylvanLakeWH 25,557 #13 Posted January 17, 2022 (edited) When I first got my C 105 I used 10/30 for first oil change and it smoked way more at start up. Went to 30 wt Shell Rotella based on recommendations from others on this site and it made a big difference… Edited January 17, 2022 by SylvanLakeWH 7 Share this post Link to post Share on other sites
Jeff-C175 7,202 #14 Posted January 17, 2022 Did you pour the SF and MMO into the fuel tank with the fuel already in the tank, or did you shake it up to mix it in a container and then pour it into the tank? I wouldn't discount that it's possible the stuff stratified and the bottom of the tank had a higher concentration of MMO and SF. 3 Share this post Link to post Share on other sites
RED-Z06 2,221 #15 Posted January 17, 2022 Seafoam and MMO are very similar...their main active ingredients being pale oil and naptha. Being petroleum based you've added more or less an oily additive that has a different flash point than gas, its not going to combust when cold so it passes thru the exhaust..as smoke. 1 Share this post Link to post Share on other sites
Digger 66 3,478 #16 Posted January 17, 2022 10 hours ago, jonw440 said: I have always ran straight 30 dinosaur oil in my old engines 1 Share this post Link to post Share on other sites
rmaynard 15,458 #17 Posted January 17, 2022 "Snake Oil"....that says it all. 3 1 Share this post Link to post Share on other sites
killroy 35 #18 Posted January 17, 2022 Never found a mechanic in a can that worked..... lol 3 Share this post Link to post Share on other sites
squonk 41,110 #19 Posted January 17, 2022 Sea foam in gas and oil = works. Mystery oil on the rusty faded paint = works. 2 Share this post Link to post Share on other sites
lynnmor 7,306 #20 Posted January 17, 2022 Gasoline in a gas tank works. Oil in the crankcase works. Money in your wallet works. 6 Share this post Link to post Share on other sites
squonk 41,110 #21 Posted January 17, 2022 Sea foam has fixed lifter ticking, carbon knock and pinging in my personal vehicles. It works Period. 2 1 1 Share this post Link to post Share on other sites
RED-Z06 2,221 #22 Posted January 17, 2022 Seafoam and Chevron Complete fuel system cleaner are the only 2 fuel additives ive ever actually seen work. Lucas is the only oil additive id trust. My cousin bought a new 1990 Z71 Sierra in 1989..first oil change he tried a new product called Lucas OIL STABILIZER. He used it every oil change at 4000 miles with whatever cheap 10w30 was on sale. In 2007 at 389k miles the 700r4 gave out and while the engine still ran fine he figured he'd pull it too and freshen it up. So we pulled it, no sludge in the pan, no cam issues, mains looked great, rods looked great, pulked tge rings off #1 and #8...all rings in spec with so little ridge we didn't need to ream it. We put in a RV cam, new lifters and put it all back together as it was. Went another 80k miles until his son wrecked it. 3 Share this post Link to post Share on other sites
rmaynard 15,458 #23 Posted January 17, 2022 (edited) I know that my opinion on this subject is not shared by all, but those who agree with me, agree wholeheartedly. Here's the reason why. Seafoam is a mixture of: Pale Oil 60% (Pale oil is straight naphthenic mineral oil) Naphtha 25% (Same as mineral spirits paint thinner, only evaporates faster) IPA 15% Isopropanol (Isopropyl alcohol) If these cheap and readily available ingredients did anything to improve the performance of either oil or gasoline, don't you think the refineries would include them in their products? As of my last research on Seafoam, I haven't found any oil or gas companies that recommend putting them into their products. And the only reason we don't still have leaded gas or straight ethanol-free gas is due to government regulations, and when was the last time that worked for everyone? I'll get off my soapbox now. Edited January 17, 2022 by rmaynard 3 Share this post Link to post Share on other sites
bds1984 1,429 #24 Posted January 17, 2022 popcorn.jfif Share this post Link to post Share on other sites
Darb1964 1,042 #25 Posted January 17, 2022 I use mm. All the time in my small engines, when I acquire a new to me tractor the first thing I do is add fresh gas and mm oil. Oil change also, there will be some smoke at start up, depending on the health of the engine it clears up after warming up. If it's been sitting for a long time I put a mixture of gas and mm down the sparke plug opening. Something a old timer showed me Years ago and I've done it ever since. Share this post Link to post Share on other sites
