Create a New Forum Admin Login Member Login Contribute to Voyager Search VoyForums Help Desk VoyForums Exchange VoyForums Directory/Categories VoyForums Homepage VoyForums News FAQ - Frequently Asked Questions

[ Show ]

Support VoyForums

[ Shrink ]

VoyForums Announcement: Programming and providing support for this service has been a labor of love since 1997. We are one of the few services online who values our users' privacy, and have never sold your information. We have even fought hard to defend your privacy in legal cases; however, we've done it with almost no financial support -- paying out of pocket to continue providing the service. Due to the issues imposed on us by advertisers, we also stopped hosting most ads on the forums many years ago. We hope you appreciate our efforts.

Show your support by donating any amount. (Note: We are still technically a for-profit company, so your contribution is not tax-deductible.) PayPal Acct: Feedback:

Donate to VoyForums (PayPal):

05 /11/ 24, 5:16am

[ Login ] [ Contact Forum Admin ] [ Main index ] [ Post a new message ] [ Search | Check update time | Archives: 1, 2, 3, [4], 5, 6, 7, 8, 9, 10 ]

Subject: Re: Synthetic Oil Author: Bob Dilks [ Next Thread | Previous Thread | Next Message | Previous Message ] Date Posted: 12/ 15/ 06, 5:42pm In reply to: Sam 's message, "Synthetic Oil" on 12/ 13/ 06, 8:17am As a general rule diesel engines should have a diet of single weight oil instead of multi-viscosity. The reason is that the shear strength of an oil is based on its viscosity. Multi-viscosity oils, such as the 5W40 that you mentioned are composed of 5 weight oil that has modifiers added to it to restrict it from thining out to less than a 40 weight oil at operating temperature. However, you still only have the shear strength of a 5 weight oil which much less than the rigors of combustion firing require. Foa a drive engine, I think a single 40 weight would be proper. The stationary perkins generator engine will run on 10W30 but a better recommendation is 15W40. As an aside comment, anyone with a Detroit Series 92 engine must use a single 40 weight oil that specifically has an API service rating of CFII (combustion firing, two cycle)which means it has an ash content of less than 1%. NAPA part number 75-118 provides an approved 40 weight oil refined by Ashland Oil Co. and sold under the Vavoline brand. It is labed Universal Fleet Plus. Other oils meeting the Series 92 requirements are Rotella DD+ and Mobile 100 40 weight. [ Next Thread | Previous Thread | Next Message | Previous Message ]