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About Brad Sears
Expertise
All automotive including antique and collectible. However if the car has been modified I can only answer in general terms and maybe get you pointed in the right direction.

Experience
Automotive tech instructor. Syndicated auto columnist 1970's though the early 1990's. Syndicated auto radio talk show, Ask Brad About cars, CBS Radio 70's through 90's TV Show "Last Chance Garage" 1980's PBS-TV syndicated. Auto instructor for the following companies: Fram Autolyte Holly Carter AMF Ford Motor University Of Conn Blue Hills Technical School Sugar River Technical Center Grew up in a family garage in Needham Mass and turned wrenches from the age of 14.

Publications
Manchester Union Leader, Nashua Telegraph, Motor Service Magazine, Yankee Magazine, Popular Mechanics (Saturday Mechanic early 80's), Los Angeles Times, New York Times, and lots more.

Education/Credentials
More than I care to remember. Basically Franklin Technical Institute in Boston, Northeastern University, Fitchburg State Teachers College, Tufts University, and a lot of factory schools along the way.

Awards and Honors
Moto Award winner. And much more.

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Classic/Antique Car Repair - oil pressure loss

Expert: Brad Sears - 11/3/2009

Question
I have a 1954 chevy 210 with a 235cu.in. motor that was just rebuit I have just 700 miles on it,changed out the breakin oil and put in 4.5 qts. valvoline 30wt. sae motor oil and a oil additive.Drove it here and there everything running fine,oil pressure is fine,cooling system fine,carburater is fine,vaccume advance disconnected because of diapharm,tire pressure fine,brakes are fine.Finally ready to take off for the coming holidays and get on the road for my 400 mile run. But first I thought I would get on the freeway and take trail run. Going 55-65mph in the middle lane everything seems to be ok for this 25 miles,all of sudden I smell oil Ilook down at the oil pressure gauge and Iam lossing oil pressure. Got of the freeway and parked it.Let it cool for hour,check oil level it was up but added a quart thinking it would make the oil thicker.New fuel pump,took a lighter and put a flame to dip stick,nothing,now Iam being told to try a 20/50wt.motor oil.Yes I made it back with some oil pressure put at low rpm there isn't any.LOOKING FOR HELP AGAIN THANK YOU DAN&DEB.

Answer
If the engine clearances were set up right on the money 30W motor oil is way to thick to get though the small clearances between the bearings and the shaft. This can burn out the bearings even though there is oil getting to them. With today's oils and the machining that we use today a 5W-30 in a fresh rebuild should work well. Time to pull the pan and check the bearings. I doubt that you will get the pressure back without work. Let me know what happens.
Brad

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