: : The "pros at citgo" evidently have never heard of an engine that has a fiber timeing gear. It takes about 500 miles of a good detergent oil to almost completely disolve the teeth on the gear. The manual that came with the little French LeMans racer says 30W Non-Detergent and you had better listen.
:Id stay with non detergent...If you really want to switch( although I see no reason why) drop the oil pan and scrub it.....dont know why you would want to switch, tho...its a tractor, not a Ferrari. It can run on damned near any oil! In any case its 40 yrs old and probably good for another 40 if you put Mazola in it! Im exagerrating but what oil is in it is not half as important as ENOUGH oil in it! : : : : I have a '49 WD that has never seen detergent oil. If I switch to Mobil1, what's the down side? So much crud breaks loose that it plugs passages, wears the engine out in 5 minutes, the synthetic finds every small leak in the seals and runs out, or should I expect to get away with this as long as I keep an eye on it and change oil when it looks bad? The lubrication is so much better with synthetic that I'd really like to change unless experience has shown that 'the cure is worse than the disease'.
: : : i had seen this asked so many times that i e-mailed the pros at citgo oil-
: : : they said that NO internal combustion engine should ever have non-detergent oil used
: : : i have never had any problem with any old iron that i have used detergent in---but don't : : : put many hours on the first few changes--- GO DETERGENT
: I have run a WD for many many years and hours with good old non-detergent oil and it has lasted for 40 years! I would not use detergent in it myself. If the old stuff works, why change and take a chance. Sure, maybe the new oils lube better but the new engines run a lot hotter and faster and require better lube. A WD runs fairly slow and steady, never does have or need much oil pressure and seems to stay pretty clean if you change the oil as you should.