Mike, There are some reports that synthetic oil may dissolve some of the residues left on different parts, which may lead to sudden increase of the oil usage. Of course, this applies to older engines. The general rule of thumb is that if you used non-synthetic oils in the past (and did it for years) you may want to stay with the same kind. If you used synthetics, there should be no issue switching to non-synthetic.
My personal experience is limited to a single car in the past, where I changed from normal to synthetic (the car was driven hard) and I ended up with an engine that burned about 1-1.5 l (1-2 qt.) of oil for 1000 km. I don't believe that you could use oil that is "too good" for the engine. As long as it is the same grade, it should work fine. In your case I would monitor how much oil is staying in the engine (and how much you burn). Good luck Marek 1994 C270 "Legato" Ottawa, ON -----Original Message----- From: CnC-List [mailto:cnc-list-boun...@cnc-list.com] On Behalf Of Hoyt, Mike via CnC-List Sent: Sunday, July 23, 2017 11:45 To: cnc-list@cnc-list.com Cc: Hoyt, Mike <mike.h...@impgroup.com> Subject: Stus-List synthetic oil I had my brother pick up 15w40 for me last week. Changed oil today and when old oil drained realized he bought synthetic 15w40. Have outing today and no time to get regular oil. Plan to drain and change later this week to non synthetic Is this an issue? Yanmar 3gm30f _______________________________________________ This list is supported by the generous donations of our members. If you wish to make a contribution to offset our costs, please go to: https://www.paypal.me/stumurray All Contributions are greatly appreciated! _______________________________________________ This list is supported by the generous donations of our members. If you wish to make a contribution to offset our costs, please go to: https://www.paypal.me/stumurray All Contributions are greatly appreciated!
