Bob said: (quoted from post at 00:58:11 08/22/13) Royse... IS there such a thing as UTF that is NOT "yellow metal safe"?
IMHO, the "yellow metal safe" issue applies to GEAR OIL, usually GL-5.
IMHO the concern over EP corrosivness in an N series is way over blown. There are no synchronizers which are the most vulnerable type of component and what little yellow metal is there (PTO cam blocks) doesn't get anywhere close to the surface pressures and temperatures that activate the EP additives. In any event with a few exceptions most modern GL-5 formulations are buffered and not particulalrly corrosive. Here is a list of ASTM D130 copper strip corrosion test results for some common gear lubes. Test results range from 1A (non-corrosive) to 4C (highly corrosive). Most of these lubes are 1B which is just a light stain - e.g. yellow metal safe in most synchronized transmissions and certainly OK in an N-series
M/T FLUID & GEAR OIL WEIGHT API CLASSIFICATION
Amsoil Long Life FGR 75W-90 GL5 1B Dark Orange
Amsoil Severe Gr SVG 75W-90 GL5 1B Dark Orange
Amsoil M/T Fluid MTF 5W-30 1A Light Orange
Amsoil MT & Gear MTG 75W-90 GL4 1B Dark Orange
Castrol Hypoy C 80W-90 GL5 1B Dark Orange
Castrol SYNTEC 75W-90 GL5 1B Dark Orange
Citgo Citgear Std XD 75W-90 GL4 1B Dark Orange
Delo Gear Lubric ESI 80W-90 GL5 2A Claret Red
Delo Trans Fluid ESI 50W 2A Claret Red
GM Synthetic Axle 75W-90 GL5 1B Dark Orange
Lucas 75/90 Synthetic 75W-90 GL5 4B Graphite Blk
Mobil 1 Synthetic 75W-90 GL5 1B Dark Orange
w/Mopar LS additive 75W-90 GL5 4A Trans Black
Pennzoil Gearplus 80W-90 GL5 1B Dark Orange
Pennzoil Synthetic 75W-90 GL5 1B Dark Orange
Red Line MT-90 75W-90 GL4 1A Light Orange
Red Line NS Gear Oil 75W-90 GL5 1B Dark Orange
Red Line 75W90 GL-5 75W-90 GL5 1B Dark Orange
Royal Purple Max-Gear 75W-90 GL5 4A Trans Black
Torco SGO Synthetic
w/Torco Type G LS add 75W-90 GL5 1B Dark Orange
Valvoline High Perf 80W-90 GL5 1B Dark Orange
Valvoline SynPower 75W-90 GL5 1B Dark Orangee
This post was edited by TheOldHokie at 07:55:03 08/22/13 2 times.
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