Author Topic: 1948 and back, 346ci oil consumption  (Read 543 times)

Offline Richardonly

  • Posts: 531
  • 1948 Cadillac Fleetwood
    • CLC Member
      CLC Member #26895
  • Name: Richard V. Pattison
1948 and back, 346ci oil consumption
« on: February 04, 2012, 08:43:45 AM »
Hi again all.

My 1948 346ci WITHOUT an oil filter does seem to use some oil although there is certainly no smoke. The manual states to check the oil level at each fill up.  This can be quite often as this vehicle gets about 8-10 miles per gallon.  It is the 60s Fleetwood model.

Do others with this engine consume oil and what is your avg mpg?

What do you feel is better to use?  A straight weight non detergent oil or a cleaner multigrade oil?

Thanks for your input.

Richard
1948 Cadillac Fleetwood 60S
1995 Lincoln Towncar, Signature Series
1995 Jaguar XJ6
2001 Chrysler Sebring Convertible
1986 Yamaha 700 Maxim X motorcycle

Offline Fred Pennington 25635

  • Fred Pennington
  • Posts: 158
    • CLC Member
      CLC Member #25635
Re: 1948 and back, 346ci oil consumption
« Reply #1 on: February 06, 2012, 12:46:09 PM »
Non-Detrergent oil is what should be used without a filter.
Detergent oils suspends the dirt in the oil so it can be removed by a filter. Without a filter the dirt circulates through the engine and can cause damage to bearings, On modern engines the oil goes through the filter first before going to any lubricated parts.
 
Non detergent oils allow the dirt to settle out in the pan and anywhere else oil will pool in the engine. This is where sludge comes from.
The maintenance schedule for these engines recommends disassembling the top of the engine and flushing with kerosene once a year to clean out sludge and to always change oil hot to pull as much dirt out with the fast running oil.

That said, allot of people do just fine with detergent oil.
They don't have the sludge issues and if you change oil frequently and don't drive much you will never find out how much ( if any ) it will shorten the life of the engine.

You need to make your own choice, based on your use.

Good Luck

Fred P.
Fred Pennington, CLC 25635
1940, LaSalle 5019

Offline 47bigcadillac

  • Posts: 125
  • CLC #25329
Re: 1948 and back, 346ci oil consumption
« Reply #2 on: February 12, 2012, 06:33:33 AM »
don't forget to add some ZDDP Plus to the oil
R. Brandys
e-mail   47@bigcadillac.com

1932 355B  Victoria Coupe            
1935 LaSalle Coupe  5077
1946 Club Coupe      6207
1947 Club Coupe      6207

Offline Brett Baird

  • Posts: 79
    • CLC Member
      CLC Member #17674
  • Name: B Baird
Re: 1948 and back, 346ci oil consumption
« Reply #3 on: February 12, 2012, 02:20:49 PM »
Fred & Rob are correct, non detergent is what was intended for these engines, and ZDDP is a must.  With that said, I use 10w30 with ZDDP in my '41.  I do not burn any oil.   

You asked about mileage.  I averaged 16 mpg mostly freeway driving 650 miles to and from Las Vegas for the Grand National in 2009.  I haven't checked my city mileage, but suspect is is around 10-12.

B Baird
17764
'41 Fleetwood 60 S
'59 Sedan DeVille 6339 "Flat-top"

Offline Richardonly

  • Posts: 531
  • 1948 Cadillac Fleetwood
    • CLC Member
      CLC Member #26895
  • Name: Richard V. Pattison
Re: 1948 and back, 346ci oil consumption
« Reply #4 on: February 13, 2012, 07:10:17 AM »
Brett,

Yowwwwwwwwwww.  I thought there was something wrong with my mileage at 8mpg.

Perhaps that is why there is black soot in the tailpipe.  I did some checking on the carb and found the 2 screws in front to be turned out 4 full turns.

I set them at 1 1/2 out, but have yet to check to see if there is any difference.  Does seem to idle smoother BUT it is dead of winter here and the chock is shut.

Thank you for the info.  Also, if gas is mixing with the oil, that may explain some oil consumption.

Thanks again to all of you,  Richard
1948 Cadillac Fleetwood 60S
1995 Lincoln Towncar, Signature Series
1995 Jaguar XJ6
2001 Chrysler Sebring Convertible
1986 Yamaha 700 Maxim X motorcycle

 



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