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A reader asks: A shop did some work on my Harley-Davidson and filled my primary with synthetic oil. I have always used regular H-D oil. Can I drain it and replace with regular oil? Will this cause any problems? Our answer: You can safely drain the synthetic oil and go back to conventional oil (but…
A reader asks: I bought a used 1998 Heritage Softail Classic with 47,000 miles. As far as I know, only mineral oil was used in this bike. I’ve heard good things about using AMSOIL Synthetic 20W-50. Is there any problem with switching to synthetic oil in an older engine? Will it leak or use oil?…
A reader asks: I’ve got a 2014 Harley-Davidson Road King. Is it OK to run SAE 60 oil in the engine rather than 20W-50? I’m thinking that a thicker oil would be better in on really hot days. I also hear that a thicker oil will quiet down engine noise. Our answer: You are far…
A reader asks: Regarding AMSOIL oil filters for Harley-Davidson engines. What is the by-pass spring setting on these filters? Our answer: AMSOIL Tech Services tells us that the by-pass spring pressure setting on both the EAOM134 (black) and EAOM134C (chrome) is 11-17 PSI. This may seem like a wide margin, but that’s the only number…
A reader asks: Can I use 75W-140 gear oil in my 2007 Harley-Davidson Road Glide transmission? Some say that the heavier oil quiets down the transmission. Is there any problem with this? Our answer: It is perfectly acceptable to use 75W-140 gear oil in Harley-Davidson transmissions. But, do consider that 75W-140 is much thicker than…
Over the years, we’ve posted a number of articles discussing the use of synthetic oil in Harley-Davidson motorcycles. Here are all of the links to these articles on one page. If you have questions on any of this content, feel free to give a us a call or contact us using the form on this…
A reader asks: I’m doing the three main fluid changes in my 2005 Harley Fatboy. For the primary, I have used AMSOIL Synthetic ATF in the past. Is that a good choice? Our answer: The use of automatic transmission fluid in Harley-Davidson primary chaincases has been a hotly debated issue for many years. Automotive ATF…
A reader asks: Did you hear that Harley-Davidson has a new oil filter for Milwaukee-8 engines? Apparently, it’s 1/2” longer than the previous oil filter. Is AMSOIL going to spec a longer oil filter for the Milwaukee-8 engine? Or is it even necessary? Our answer: AMSOIL is not changing their oil filter recommendations for the…
A reader asks: I’ve got a 2019 Harley-Davidson Street Glide with the Milwaukee-8 107 engine. When using conventional 20W-50 oil, I hear a valve ticking noise at about 2100 RPM. Will AMSOIL Synthetic 20W-50 cure this noise? Our answer: Some customer feedback seems to suggest that this particular valvetrain noise disappears once they switch to…
AMSOIL is making additions and adding new options to the V-Twin Oil Change Kits for Harley-Davidson motorcycles. Here are the details. AMSOIL had previously offered oil change kits only for Twin-Cam engines. AMSOIL will now offer a synthetic engine oil change kits for Milwaukee-8 engines. The other new feature of these oil change kits is…
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