M123KT-450 oil preference thread

[ak diesel driver]

The articles I've read didn't differentiate. But I would have to think that racing engine are under more stress. I know diesels have more torque but I would think that Rpms would be more of a factor for higher oil pressure than the torque load. Now volume is a whole different story.

 

[M123KT-450]

If my 6.5-T was designed for 35-45psi the manual would simply stat thats as the operating PSI but it dosen't it states the operational PSI is 60 end of story.

The Mack GMC n Stude Recommend SAE40 oils there now 30 40 50 years older and SAE40 dino is about oblsolete in both diesel and gasoline oils. . .So i have been using the SAE60 synthetic in those trucks. . .Both the 62' GMC n the 59' Mack have been pumping the SAE60 synthetic oil for 10 years without any issues both trucks fries up right in cold weather tho they are never driven in the winter months i still fire them up once a month for an hour. . .

I ran SAE60 synthetic in my old 5.8L Ford F-150 for 80,000 miles with out an issue the trans failed i bought the 95 GMC which now has 2,000 miles on SAE60 synthetic oil which dose in fact carry a rather high Gas, Diesel and alky engine ratings. . .

The engine builder recommened a 20w-50 for my AMX i asked if SAE60 would be ok he said yes it would be better in fact he also suggested i do the same to the engine he built for my GTA trans am.

I than asked him well what about the 351M in the old F-350 he said in the summer time would be i he suggested it be plugged it in for an hour before firing it up during the winter months as well as the other Vintage trucks. . .

So after getting the approval from my engine builder i than in turn ran the SAE60 synthetic found it to be out performing the oils i was currently using.

Now again so you don't forget by out performing i mean:
Cooler water temps.

Faster starting.

Better oil pressure.

Cooler Oil temps.

Longer service intervals.

Cleaner engines internally.

every now and then i have my current engine shop open up my motors and inspect them for component wear and sludge build up.

So far engine builder has stated:
" They are wearing very well they are incredably heathly for there age and milage "

" cylinder walls have considerably low ridge "

" pistons have no scaring "

and

" they look very clean block is clean, carbon build up is rather low the is no sludge or contamination built up in the oil pans or valve covers, the rotating assemblies are clean and free of build up "

I try to have these motors inspected every 2 years or so and these are the reports i have been getting back.

All of my Vehicles get the same service intervals:

Oil filter every 3,000 miles.

Fittings greased every 6,000 Miles.

Oil change every 9,000 miles.

Fuel filter Air filter Coolant filter every 18,000 miles.

Gear Lubes changed every spring unless they get wet.

Coolant every other spring.

Every unit is serviced with AMSOIL products.


This is also why i have not bothered with oil testing in the past. becuase it seems to be working rather well.

Now yes they are mostly Gas engines. . .

But the 59 Mack is a diesel its under the same strain if not more so then the 6.5-T as the Mack is non-Turbo diesel with a turbo charger added its running 8-12PSI of boost on a 20:1 C/R towing loads as heavy as 120,000LBs and it passes its inspections.

Mikey

 

[M123KT-450]

Now my oil cap on my 95 6.5-T says to use oil with API ratings of SG/CE.
The owners manual states you can use oils with API service rating of SG/CE or higher.

AMSOIL SAE60 is is API rated SJ/CF which is with in Spec of the 6.5-T diesel.
Is also formulated for Turbo charged and Super charged engines.
It is also has anti fuel dilution additives.
it clearly states that it can be used as regular motor oil were an SAE60 oil is required which also means it ahs the proper detergents required for day to day driving. . . .

Mike