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| | | | Joined: Apr 2005 Posts: 926 Shop Shark | | Shop Shark Joined: Apr 2005 Posts: 926 | After I rebuilt the 350 in my '62 one ton,I ran it for abouty a thousand miles on regular oil,then changed over to synthetic. I drove on that for about 4 months and it didn't use even a half quart. then I drove to Reno (about 300 miles) and in that distance it used 4-1/2 quarts! Any ideas why if didn't use oil for local driving and driving less than 50 miles each way on the freeway,but when I drove a little more distance my truck started gulping the expensive oil?
Speed | | | | | Joined: Jul 2004 Posts: 5,708 'Bolter | | 'Bolter Joined: Jul 2004 Posts: 5,708 | speed 6351,
I guess my thought would be it either leaked it or burned it. Have you given it a once over for leaks or did you see any smoke out the exhaust on your way to Reno. I don't think the problem can be pinned on the switch from regular to synthetic. A compression check might find a compromised cylinder...but that's a lot of oil to burn. I would think more along the lines of a leak.
Stuart | | | | | Joined: Mar 2007 Posts: 173 'Bolter | | 'Bolter Joined: Mar 2007 Posts: 173 | Maybe the extended period at operating temperature allowed a leak to open up, that the shorter distances didn't allow for. I wouldn't be surprised if it opened up several leaks that the old conventional oil couldn't fit/leak through. | | | | | Joined: Apr 2005 Posts: 7,441 Bolter | | Bolter Joined: Apr 2005 Posts: 7,441 | Check your positive crankcase vent valve.
Martin
'62 Chevy C-10 Stepside Shortbed (Restomod in progress)
'47 Chevy 3100 5 Window (long term project)
‘65 Chevy Biscayne (Emily)
‘39 Dodge Business Coupe (Clarence)
“I fought the law and the law won" now I are a retired one!
Support those brave men/women who stand the "Thin Blue Line"! Hug a cop!
USAF 1965-1969 Weather Observation Tech (I got paid to look at the clouds)
| | | | | Joined: Oct 2005 Posts: 40 Wrench Fetcher | | Wrench Fetcher Joined: Oct 2005 Posts: 40 | Pull your spark plugs and see if its burning it. If there is a build up on one side of the plug its coming through the valve guide, if its all over its coming passed the rings. | | | | | Joined: Feb 2006 Posts: 395 Shop Shark | | Shop Shark Joined: Feb 2006 Posts: 395 | if you have a leak of that much in 300 miles the under side will be oil soaked and dripping..as far as burning 4 qts in 300 miles you should see smoke..check pcv and plugs look at tail pipe,,maybe you broke something inside..if you cannot find problem go back to a breakin oil and run the snot out of it for another 1000...doc | | |
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