Posted by Steven f/AZ on February 14, 2021 at 07:00:21 from (173.241.179.52):
In Reply to: Synthetic Oil posted by MtMan on February 14, 2021 at 06:45:46:
I use synthetic in my H and M, rebuilt the engine in the H about 18 years ago and have always run Mobil Delvac 1 5w-40, it hold 70 psi all day long and drops to 50 psi when hot at a low idle. The M I just put together but that has Rotella T6 15w-40 in it. Most of the equipment on the farm gets JD 15w-40 Plus 50, from F12, F14, A, C, H, 544, 886, 1086, etc. I even use it in the old tandem axle trucks.
I have switched many vehicles to synthetic oils once I bought them over the years. The latest was a 98 Grand Caravan with 285k on it when I bought it. Changed oil to Mobil 1 10w-30 and it still doesn"t use more than maybe a pint in 3000 miles. And there are NO NEW LEAKS! Don"t buy into the old tales of how synthetic oil causes leaks, it has never happened to me in 30+ years of running synthetic oils. In fact, after almost 40 years on this earth, I have never had an oil related failure of any engine - from heavy farm equipment to Honda cars running 7000 rpm.
Also, unless you have PROOF that someone has gone to the trouble to find the ANCIENT SAE 30 non-detergent oil for the past 70 years, don"t bother finding that garbage. It is HIGHLY UNLIKELY that someone has bothered to keep using such an antiquated oil in their equipment. If you are concerned that a detergent oil is going to knock so much sludge loose that it will ruin your engine - it probably needs an overhaul anyway. Pull the valve cover, side cover, and oil pan if you are concerned about sludge...
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