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#1
07-02-2018, 07:59 PM
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What engine oil are you running?
Hi All,
Just a question. What engine oil is everyone running and what viscosity? My '73 with the 350 motor has started leaking oil at the rear main seal and someone suggested running a thicker oil to see if it takes up. Your thoughts? |
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#2
07-02-2018, 08:04 PM
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Forget it,use the oil your engine needs.You might slow it down a touch but you wont stop it.tom
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#3
07-02-2018, 08:10 PM
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10W30 and my hot idle oil pressure on all my Pontiacs is 25-30 psi.
Replace the seal.
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1976 LeMans B09 Freeway Enforcer, 455/M40 Smokey 1977 Trans Am, 400/M21 Black/Gold Bandit. 44K actual miles 2017 Sierra SLT 1500 Z71 4X4  2019 Canyon SLT Crew 4X4  
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#4
07-02-2018, 08:55 PM
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I run 10w-30 as well, and add a small bottle of Zinc. Usually my oil is synthetic, but The miles I put on are low.
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#5
07-02-2018, 09:07 PM
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Havoline or Valvoline and a bottle of ZDDP plus with Baldwin filters. 10w30 in my 462. Hot idle is 35-40lbs. 10w40 in my wifes 400. 20lbs hot idle,
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#6
07-06-2018, 12:04 AM
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The rear main seal in my ‘71 got so bad that anytime I drove it I’d leave a 2” diameter oil puddle at a parking spot as well as lightly lubricating my floor pan. I broke down and rebuilt my never apart ‘71 455 HO about 10 years ago primarily because of the rear main seal. Ever since the break in I’ve run Mobil 1 15w-50. It been great, almost zero oil consumption. And I replaced the rear seal with a BOP neoprene seal.
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#7
07-09-2018, 10:20 AM
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Brad Penn 10w30 in my muscle cars.
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Redline Design |
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