Eddie-O Posted March 22, 2020 Share Posted March 22, 2020 Hello everyone, I am new to this forum and the new owner of a 41 Buick Sedanette. I have a few questions I'd like to ask and forgive me if they sound like a novice question, but I am a novice when it comes to this car. I do own another newer classic (not as old) corvette and was a mechanic for g.m. for twenty five years but never on a car this old. There's not much I can't handle on this car mechanicly but the issues I have relate to all the fluids. I have the 41 GM shop manual, but all the fluids listed are by GM 's consumer names and part # and don't list weight or viscosity. Could anyone tell me the correct fluids for: Rear Axle- is it still 90 weight gear oil? 3Speed Manual Trans. fluid Brake Fluid DOT # Engine oil- I plan on using straight 20weight in straight 8 w/ dual carbs. I know this sounds stupid and I feel stupid asking for such a basic issue, but all the manual says is use GM or Buick " Super Dupper "or some other long discontinued type of name for their fluid. Please don't laugh too hard over this question, but I feel in love with the car the day I saw it and I don't want to make any mistakes on such a beautiful car. I'll probably have a ton of other questions as I get more into this car, but for now the basics are my main concern. Thank's in advance to anyone who can stop laughing long enough to answer. All the best Ed 2 Link to comment Share on other sites More sharing options...
keiser31 Posted March 22, 2020 Share Posted March 22, 2020 Welcome to this forum! You will want to scroll down to the Buick section for that information. You will get LOADS of help. 2 Link to comment Share on other sites More sharing options...
MCHinson Posted March 22, 2020 Share Posted March 22, 2020 Welcome to the AACA Discussion Forum. I would also agree that you will find plenty of help in the Pre-War Buick Forum if you scroll down there. Based on my experience with a 1937 Buick, I would recommend that the best option for the Transmission and the Rear End would be the following: https://www.oreillyauto.com/shop/b/chemicals---fluids-16461/maintenance-chemicals-16867/grease---lube-16582/gear-oil---additives-16905/gear-oil---140w-20063/587d6374459f Engine Oil recommendations will likely be all over the map from different forum members. Almost any modern oil you choose will be better than what was available in 1941. Diesel oils typically have higher ZDDP levels which are a good idea. There are also a few other oils with higher ZDDP levels available. Brad Penn oil has been recommended in the past. Personally, I don't recall the brand name right now, but I have purchased a high ZDDP motor oil at Family Dollar Store for the last few years. I can't seem to find it on the Family Dollar website at the moment, so I am not sure if they still stock it. I will try to find the name in the next day or so if possible. For brake fluid, you need to either use whatever is in it now, or even better flush the system, rebuild everything, and then use your choice. What is best to use for brake fluid will likely also result in many conflicting opinions. Link to comment Share on other sites More sharing options...
Eddie-O Posted March 22, 2020 Author Share Posted March 22, 2020 Thanks McHinson! I'm still trying to tip toe through the forum index and will repost in Buick. Thanks Ed Link to comment Share on other sites More sharing options...
John_S_in_Penna Posted March 22, 2020 Share Posted March 22, 2020 (edited) Eddie, our "General Discussion" category is excellent for many questions--and gets the most looks and responses--but I agree with Matt Hinson above, that the Buick categories will get you good and specific Buick advice whenever you need it for your car. Look for the category "Buick--Prewar--Technical." Some of our other categories, such as Nash and electric cars, get few looks, and answers may not come quickly, if ever. But all the Buick categories are well populated with knowledgeable Buick fans. All the best to you with your new-old Buick! Edited March 22, 2020 by John_S_in_Penna (see edit history) 2 Link to comment Share on other sites More sharing options...
Dandy Dave Posted March 22, 2020 Share Posted March 22, 2020 Never any novice or dumb questions here. Much better to be informed. I've been wrenching on all types of stuff for over 50 years and still ask questions. Sometimes it is because of old timers disease and just can't remember. Other times I'm still learning. Dandy Dave! 1 Link to comment Share on other sites More sharing options...
John_S_in_Penna Posted March 22, 2020 Share Posted March 22, 2020 6 hours ago, Dandy Dave said: Never any novice or dumb questions here. Much better to be informed. I've been wrenching on all types of stuff for over 50 years and still ask questions. It is said that the smart people are the ones asking questions--- 2 Link to comment Share on other sites More sharing options...
MCHinson Posted March 23, 2020 Share Posted March 23, 2020 (edited) I was in the garage and looked at my oil to see what it was. It is American XT 10W-40 manufactured by the Warren Oil Co. LLC. It has served me well for thousands of miles in my 1937 Buick Century. I have not purchased any in the past several months, but I have purchased it at Family Dollar Store (my only reason for going to Family Dollar Store). The funny thing is that doing a Google search for it, revealed that apparently Family Dollar Store has been sued in NJ for selling this oil as it is alleged to not be suitable for modern engines. Edited March 23, 2020 by MCHinson (see edit history) Link to comment Share on other sites More sharing options...
mike6024 Posted March 23, 2020 Share Posted March 23, 2020 Apparently that lawsuit does not apply to American XT 10W-40 Only to the 30W, not the multi weight. Because the 30W has no additives fro modern engines. Additive Name Additive Function Antioxidants oxidation control Dispersants varnish control Antiwear agents minimize valve train wear Antifoamants retard foaming Anti corrosion prevent corrosion (Fe) Lubricity additives improve metal wetting Metal Detergents keep surfaces clean Viscosity modifiers high temperature viscosity increase Pour point depressants allow oil flow when cold Seal swell agents ensure seals do not leak Metal deactivators reduce catalytic effect of metals Corrosion Inhibitors prevent rusting (Cu, Zn, Sn) Extreme pressure additives prevent scoring and seizure Friction modifiers reduce or increase friction The 30W has none of these. The photograph below is a close-up of AMERICAN XT SAE 30's back label, which includes the warnings, "IT IS NOT SUITABLE FOR USE IN MOST GASOLINE-POWERED AUTOMOBILE ENGINES BUILT AFTER 1930" and "USE IN MODERN ENGINES MAY CAUSE UNSATISFACTORY ENGINE PERFORMANCE OR EQUIPMENT HARM.": The 30W is grade API-SA which means no additives. API-SL has additives fro modern engines. FINALLY there is PROOF !!! In an internal report dated November 8, 2004 the "Alliance of Automotive Manufacturers" (Members at that time were: BMW, FORD, DaimlerChrysler, GM, Mazda, Mitsubishi, Porsche, Toyota and VW) compared the obsolete but still widely available API SA engine oil with in 2004 current API SL category (ILSAC GF-3). The two oils were tested using two standard ASTM tests: ASTM Sequence IVA = low-temperature Valve train wear test ASTM Sequence VG = test for sludge and deposits No surprise: the API SA oil failed both tests ! Results: Oil Filter clogging, extreme scuffing on camshafts, oil starvation on cold start up. Conclusion: "Engine life would be short, regardless of the oil change interval" 1 Link to comment Share on other sites More sharing options...
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