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Canadian Poncho Homepage -> Canadian Poncho -> General Engine Performance Forum -> Is it safe to use Synthetic Oil in a vintage motor.
Post Info TOPIC: Is it safe to use Synthetic Oil in a vintage motor.
dualquadpete


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Is it safe to use Synthetic Oil in a vintage motor.
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I tried it in lawn tractor/snowblower last winter, & now crankshaft seal is spotting oil the floor!! Went back to regular oil & hope drip stops???

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long stroke


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Yes, the modern extra slippery stuff is only for modern power plants.



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1957 Pontiac Pathfinder Deluxe sedan restored 261 six

1974 Chevrolet Caprice Estate wagon low mileage original 400 V-8
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That's likely what blew out the rear seal of my generator.

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68beaumont


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I've been using Mobil One 5w30 Synthetic along with GM EOS in both 68 Beaumonts, no issues so far, rear mains have always dripped a bit even on conventional oil.

 



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66 Grande guy


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Same as me in the 66 Beaumont. Works great!



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ken from northern Alberta

38 Willys pickup electric

39 Buick (327 with 700 r4)

66 Beaumont 4 door hardtop

69 Chevy CST pickup

1976 GMC 23'  motorhome

1994 Impala SS 

1968 Citroen Fourgonnette (Yeah Carl!)
long stroke


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You two guys are really lucky. For a month or so i was good on my 1974 400 V-8 and then there came the drips from the real main seal. My 1974 400 has never and i mean never dripped any oil what so ever until i put synth in it. I went back to fossil and it has been leak free ever since. 



-- Edited by long stroke on Monday 5th of October 2020 01:21:56 PM

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1957 Pontiac Pathfinder Deluxe sedan restored 261 six

1974 Chevrolet Caprice Estate wagon low mileage original 400 V-8
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