Juday1951 Posted October 11, 2011 Report Posted October 11, 2011 One word of caution on that... if your engine is relatively high mileage, and has a lot of sludge build up, you may discover that things will start to leak after a while. Synthetic oil tends to clean things up and in some cases the sludge was plugging the holes that would otherwise let the oil out. Once it all gets cleaned out things may sprout leaks. My engine has been overhauled so I didn't have that concern. I don't want to discourage you from using Amsoil, as I think it is a wonderful product, but thought you should know a possible side effect. Merle Like you, I use Amsoil in EVERYTHING I own that requires a lubricant. I have no fears of using the oil. I can at least try it... Quote
greg g Posted October 11, 2011 Report Posted October 11, 2011 Do not use modern hypoid gear lube. It contains additives and shear modifiers that are not friendly to bronze. Bronze is used in our era transmissions in the synchronizers. If your truck is non synhro perhaps its ok. I believe anything after GL4 rated gear lub is a no no for these trans. Quote
ggdad1951 Posted October 11, 2011 Report Posted October 11, 2011 Do not use modern hypoid gear lube. It contains additives and shear modifiers that are not friendly to bronze. Bronze is used in our era transmissions in the synchronizers. If your truck is non synhro perhaps its ok. I believe anything after GL4 rated gear lub is a no no for these trans. odd, I called the well respected shop that rebuilt my tranny and they said that was a myth when I was filling my fluids. Quote
TodFitch Posted October 11, 2011 Report Posted October 11, 2011 odd, I called the well respected shop that rebuilt my tranny and they said that was a myth when I was filling my fluids. My 1933 Plymouth transmission has roller and/or ball bearings through out. However I've seen cut-away diagrams of transmissions for other brands that used brass or bronze bearings in various places like the cluster gear shaft and/or the reverse gear shaft. So I think it may depend on brand and year. Quote
Young Ed Posted October 12, 2011 Report Posted October 12, 2011 odd, I called the well respected shop that rebuilt my tranny and they said that was a myth when I was filling my fluids. Thats nice to hear. I'm pretty sure I'm running hypoid in both my car and truck trans and whatever I'm running its been in there for 8 and 11 years. Quote
greg g Posted October 12, 2011 Report Posted October 12, 2011 Well several internet sources warn against using the new stuff in old gear boxes. And you know how much faith you can put into what you read on the www. And maybe it takes time and mileage to have any effects show up, and since we don't typically put a lot of miles on these assemblies it could take considerable time before any issues may become observable. But I made the choice to find a source for some of the old GL2 stuff. Several of the newer Synthetic manufacturers state in their write ups that their formulas are white metal safe, so there could be something to the concern inspite of what folks believe to the contrary. Like always you pays your money and makes your choices. Quote
Scruffy49 Posted October 14, 2011 Report Posted October 14, 2011 Oil, gas and gear lube. Way to start a fight... My 49 started and ran fine with the semi-solidified Pennzoil my grandpa put in it in 1974. Was not started until 1994. Sat again without cranking until 2004. Last cranked in 2008, heard rings tinkling down into the oil pan... Whatever gear oil was in it in 1974 was topped off in 1994 and is still in the transmission and differential. And still clean. Last greased in 1994 with Slick 50 brand grease. Still green. My 69 truck with a 318 runs Wal-mart brand filter (changed once a year) and Wal-mart brand whatever grade is handy. I don't change the oil, just try to keep up with the leaks. Same with the transmission (which really likes Type F fluid). Diff gets modern gear oil, whatever was on sale before the axle seals were replaced. Both have green coolant, some rust issues. Nothing a few ounces of ATF in the radiator won't fix. Cheapest garbage gas I can find. Trucks, not sports cars. Quote
Don Coatney Posted October 14, 2011 Report Posted October 14, 2011 Nothing a few ounces of ATF in the radiator won't fix. Splain? What does the ATF in the radiator do???? Quote
shannont Posted November 17, 2012 Report Posted November 17, 2012 So is the bottom line my 51 Dodge 4-speed needs GL2 only or is it a urban myth? If I require GL2 where do you buy it?? A little concerned since I know first hand how motor oil attacks the silver in jet engine bearing cages. Quote
Local2ED Posted November 17, 2012 Report Posted November 17, 2012 I have been mixing Marvel Mystery Oil in Everything I own that uses gas for about 15 yrs. now and the only gas attributed problem I ever had was on my Echo weedwacker. The three hole rubber grommet on the fuel tank got mushy.(after 15 yrs, $2 to replace) I live in a state that has summer/winter blend gasoline. I just put in what the bottle says to use. I've heard alot of complaints about ethanol in gas but I've had basicly none. Just relaying my experience, thats all. Quote
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