Nothing wrong with multi-viscosity oil at all. I use Shell Rotella 15W40 diesel oil. It has been a long time since single-weight oil was the only viable choice. I even use Shell 15-50 in airplanes now that are right up there with the A4 for antique tech.
Joe Coquina From: Josh Muckley via CnC-List <cnc-list@cnc-list.com> Sent: Tuesday, August 1, 2023 1:55 PM To: Stus-List <cnc-list@cnc-list.com> Cc: Josh Muckley <muckl...@gmail.com> Subject: Stus-List Re: [EXTERNAL] Re: Atomic 4 reversing - help, help Y'all piqued my interest. The Castrol website is a bit of a pain to find their motorcycle product specs. Ultimately, I found all of the motorcycle oils are multi viscosity. So it seems like Castrol is out of the picture. I have little to no experience with Castrol tech support but can attest to phenomenal tech support from AMSOIL. Call their tech support and explain the problem they can most likely find a product for your application based on friction coefficients and viscosity, not based on designated product application. I was overwhelmed by the choices of hydro oil for my backstay. The manufacturer simply said ISO 32. What!? Amsoil tech support was very helpful and found their power steering fluid to fit the bill. Best of luck, Josh Muckley S/V Sea Hawk 1989 C&C 37+ Solomons, MD Aug 1, 2023 11:28:58 Sylvain Laplante via CnC-List <cnc-list@cnc-list.com<mailto:cnc-list@cnc-list.com>>: It's classification is API SP .. As I said look for API SF or older ( for our engines ). Several antifriction were added after SH/SF and in addition to that, they reduced the famous "ZDDP" additive which is so important for the last level protection to prevent oil breakdown. That ZDDP can clog catalist converter but our A4 don't have that problem :-) I've done a 5 day motoring with my A4 and it did not burn oil noticeably ( still close to the dipstick top mark ) and not really black/dirty. Still original 1975 A4 . I change oil twice a year and when it is hot since we don't have an oil filter. Castrol site says a few things about motorcycle oils and this was the oil Moyer used to recommend on it's site.. MOTORCYCLE VS MOTOR OIL | Castrol® USA<https://www.castrol.com/en_us/united-states/home/motorcycle-oil-and-fluids/motorcycle-vs-motor-oil.html> MOTORCYCLE VS MOTOR OIL | Castrol® USA Many drivers wonder if you can use normal oil for their motorcycles. Learn the key differences to settle the iss... Sylvain 1975 C&C27 On Tuesday, August 1, 2023 at 10:36:06 AM EDT, Paul Hood via CnC-List <cnc-list@cnc-list.com<mailto:cnc-list@cnc-list.com>> wrote: This is the SAE30 oil I’m using. https://www.okpetroleummarketplace.com/castrol-sae-30-hd-30-motor-oil-6-quarts.html Paul Hood 416.799.5549 From: Joe Della Barba via CnC-List <cnc-list@cnc-list.com<mailto:cnc-list@cnc-list.com>> Sent: Tuesday, August 1, 2023 10:09 AM To: 'Stus-List' <cnc-list@cnc-list.com<mailto:cnc-list@cnc-list.com>> Cc: j...@dellabarba.com<mailto:j...@dellabarba.com> Subject: Stus-List Re: [EXTERNAL] Re: Atomic 4 reversing - help, help I would think about an oil change and use oil designed for motorcycles with a wet clutch and see if that helps. Joe Coquina Please show your appreciation for this list and the Photo Album site and help me pay the associated bills. Make a contribution at: https://www.paypal.me/stumurray Thanks for your help. Stu
Please show your appreciation for this list and the Photo Album site and help me pay the associated bills. Make a contribution at: https://www.paypal.me/stumurray Thanks for your help. Stu
