Date: 21 Jun 2005 09:36:31 -0700 From: "yaofeng" <yaofengchennospaml.com> Subject: Re: synthetic oil
It will hurt your pocket book for one. Synthetic oil is three to four times as expensive as regular motor oil. I used to change oil every 5k miles using regular motor oil. Now I do 10k. You can just feel the difference in engine lubrication, especially in the dead of winter morning start-up. People claim the detergent effect of syntheitcs make the engine more susceptible to leaks. I haven't seen it on mine. On your 91 not having a transmission oil drain plug. I know some people tap a hole to make one.