missing oil
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Freshman User
Joined: Dec 2007
Posts: 47
Likes: 0
From: Utah
missing oil
OK I don't know alot about this truck as it is my father in-laws but his problem is this on a 1991 F-150 4X4 5.0. He is losing 2-3 quarts of oil between oil changes. His motor is clean and shows no leaks. There is no drips in his driveway and it doesn't smoke so we don't think it is burning it. Any thoughts?
Tuned
Joined: Aug 2007
Posts: 287
Likes: 1
Possibly valve seals. Check the condition of the plugs for telltail signs.
I was losing 1 qt in 500 miles on a new reman. In my case the threads on one spark plug were covered with fresh oil. Drove me nuts until someone on this forum came up with the idea.
I was losing 1 qt in 500 miles on a new reman. In my case the threads on one spark plug were covered with fresh oil. Drove me nuts until someone on this forum came up with the idea.
FTE Legend
Joined: Jun 2006
Posts: 31,930
Likes: 1,499
From: Ottawa, Ontario
Is the inside of the tailpipe clean or black? If it's black it's burning it, just slow enough that you can't see it under normal driving conditions. This is not at all uncommon and not really a sign the motor is about to quit, it probably wouldn't pass an emissions sniffer test though.
I'll add that if that motor isn't getting roughly 15mpg on average it's running rich and that will increase oil consumption.
I'll add that if that motor isn't getting roughly 15mpg on average it's running rich and that will increase oil consumption.
Thread Starter
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Freshman User
Joined: Dec 2007
Posts: 47
Likes: 0
From: Utah
Is the inside of the tailpipe clean or black? If it's black it's burning it, just slow enough that you can't see it under normal driving conditions. This is not at all uncommon and not really a sign the motor is about to quit, it probably wouldn't pass an emissions sniffer test though.
I'll add that if that motor isn't getting roughly 15mpg on average it's running rich and that will increase oil consumption.
I'll add that if that motor isn't getting roughly 15mpg on average it's running rich and that will increase oil consumption.
He said the tailpipe is clean and it passes emmisions. I will be seeing him saturday and will check both of these suggestions
