Re: Re: synthetic lubes

Posted by Jon H on March 30, 2004 at 22:44:23 from (69.26.16.250):

In Reply to: Re: synthetic lubes posted by buickanddeere on March 30, 2004 at 19:52:00:

One thing to consider with antique equipment is that a badly worn and irreplacible part that is near the end of it's usefull life,will often function like a good part and will last a lot longer if lubed with synthetic oil or grease. I had that experience with a 40's engine with a flat crank. the mains journals were badly worn,and I was unable to locate any undersize bearings so I could regrind the crank. I finally located a set of NOS std size main bearings which were installed and stopped the rumble in the crankcase for a few weeks. Due to the bad crank journals,the new bearings started to fail and the rumble started to return. On the chance it might help,I replaced the mineral oil with 20-50 Mobil 1 synthetic oil,This stopped the noise and allowed me to run the engine as a daily driver for 3 more years with no apparent wear of the main bearings inspite of the bad crank. I finally retired the rig to only ocasional use with synthetic Mobil 1 still in the engine. I guess this would fit under the heading of an extreme pressure application. My experience with Mobil 1 oil in engines with some cylinder and ring wear is that oil consumption is only half of what it was with mineral oil.
Mobil 1 synthetic gear oil really helps with weak or worn driveline parts. I had a White 8800 combine that had a poorly designed gear box on the cylinder drive,the box would need shim plates and bearings every year. after filling it with synthetic gear lube it would last 4 years between rebuilds. The Shelbourne Reynolds stripper header for my combine states in the operators manual that only synthetic gear oil be used in the gear boxes,with Mobil 1 brand being recommended. I have noticed much less wear and torque lock of the driveline slip joints in my Steiger 4WD tractors since switching to Mobil 1 synthetic grease. The synthetic oils and grease are 4X the price of mineral grease/oil,but have proven to be well worth the cost with the great reduction in wear I have seen in the 20 years I have used it.

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