Surfnturf,

I've not had good luck with the few engines I've torn down that were
stored for some years with old oil. All the bearings and machined
surfaces were shot. From what I understand this is due to the sulfur
compounds that come out of the oil when heated combining with water to
form sulfuric acid. It's been a while though, maybe the new oils don't
do that.


Regards, Ron

Condensation was the likely culprit. Which is why it helps to change the
filter often. But yes, have seen pitting at times on bearing journals which
would be due to oxidized sulfur componds disolving in the moisture.

Modern fuels are perhaps less prone to this with the emphasis on cleaner low
sulfur feedstocks.

Cheers,
surfnturf

"Ron Thornton" wrote in message
...
Surfnturf,

I've not had good luck with the few engines I've torn down that were
stored for some years with old oil. All the bearings and machined
surfaces were shot. From what I understand this is due to the sulfur
compounds that come out of the oil when heated combining with water to
form sulfuric acid. It's been a while though, maybe the new oils don't
do that.


Regards, Ron

Sulphur is a favorite component of extreme pressure oils.
It has a characteristic smell. Come to think of it, it is the
sulphur component in eggs that provides bad smells.

Brian W

On Thu, 20 Nov 2003 19:18:46 -0500 (EST), (Ron
Thornton) wrote:

Surfnturf,

I've not had good luck with the few engines I've torn down that were
stored for some years with old oil. All the bearings and machined
surfaces were shot. From what I understand this is due to the sulfur
compounds that come out of the oil when heated combining with water to
form sulfuric acid. It's been a while though, maybe the new oils don't
do that.


Regards, Ron

That's why you should never use eggs in the crankcase.

Ron

On Fri, 21 Nov 2003 09:37:01 -0500 (EST), (Ron
Thornton) wrote:

That's why you should never use eggs in the crankcase.

Ron

Nor EP oil on the bacon?

Brian W