11/5/2023 0 Comments M8 transmission oil change![]() They must have found out the SYN 3 wasn't up to scratch in the first place so the supplier of the oil reformulated it for them. That's quite interesting, as I hadn't seen that ad before. And Harley STILL recommends Syn 3 for use in transmissions. No mfgr will recommend use of a product they never tested. If for some reason it didn't work out, they would be liable to fix alot of motorcycles. They stated that they never tested it, so that's why they didn't recommend it's use in their motorcycles. I never understood why people think Harley denied the use of synthetic oil. With no dregs sitting around in bottles in the garage gathering dust and cluttering up the place. It's certainly a serious temptation though, to only have to buy a neat quantity of 6 x 1qt bottles of the same fluid, for the ultimate in convenience to service your bike. I wouldn't be surprised to see Amsoil change their recommendation in the fullness of time, to ultimately only recommend the SVT gear oil in the HD transmissions. Harley have quietly backed away from the recommendation to put it in all 3 holes.Įven though I personally believe the Amsoil MCV is probably suitable in most applications for use in the transmission, I also think their recommendation was only to be seen to be inline with HD at the end of the day. It was a marketing tool that has proven to be flawed in practice. It was so good, you could almost wash your genuine HD motorclothes with a capful added in the wash. It only coincided with HD's release of the SYN 3 oil as their magic miracle oil for everything in Harley world.Īfter years of HD's synthetic oil technology denial.Īll of a sudden HD released their SYN 3 oil as a miracle in a bottle, that was sooo good you can actually put it in all 3 holes, and a cure for coughs colds and all manner of genuine HD ailments. ![]() I totally agree in regards with the same oil in all three holes recommendation by Amsoil. In practice, it's irrelevant to the proper operation of the machine, as long as the fluid levels are maintained in accordance with the tolerances outlined in the owners manual. High quality synthetic oils have been known to run a little cooler in service, and this is the only factor that will potentially influence operational fluid levels.Īnd only if one can actually take accurate enough readings to be able to tell with any absolute certainty when the machine is hot? The only variation will possibly be in the temperature of the oil at operating temps. Synthetic oil has the same coefficient of expansion as mineral oil when heated. Or 6 quarts Amsoil 20w-50 will cover all three holes. You will see the lip when you take the cover off. The SVT gear oil will get rid of the dreadded tranny whine and hard shifting.Īmsoil 20w-50 in Primary - Book calls for 38 oz but most techs drop in 32 oz or 1 qt cause their too lazy to look at the shop manual. Call Amsoil Tech department if you don't believe me. Amsoil chart shows the 20w-50 engine oil because that's Harley's recommendation. ![]() ![]() If you run bike at highway speeds and oil starts coming out of the air cleaner, you've put too much in the engine.Īmsoil 75-110w (SVT) Gear oil in the Tranny - 1 qt. Because the oil is Synthetic is will not expand. Book calls for 4 quarts but Put in 3.5 quarts with filter change and then run bike until it gets hot and recheck. 2012 FLHTK has the 103 engine and 6 spd same as my 2011 FLHTK.Īmsoil 20w-50 in Engine.
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