A strange on going issue. I have a 292 that I rebuilt several years ago. It runs great, but every year when the temperature drops, my oil pressure goes nuts. When cold ,when fired up, a steady 50lbs. As it starts to warm and I start to drive, the mechanical guage ( 4th one) will start to slam up to 80-100 psi. When it gets up to temp, it settles down to a steady 40-55 lbs. I run 10-30 oil, and have checked the relief valve in the gear type pump. This has gone on for years and have never blown out a filter or anything, but it does have me scratching my head at this time of year.( temp in the 40s). Hmmm

I don't have a number. If anyone here knows, it's Ted. As a general rule, any dual viscosity 40 or higher (10w40, 20w50, etc) and any single viscosity is already sufficient. I wouldn't add anything to it. If you use a dual viscosity 30 and lower (10w30, 5w20, etc) you will need an additive. If there is ever any doubt about an oil, ask the manufacturer which of their oils they recommend for a flat tappet engine.


Lawrenceville, GA