That is really confusing, if I search on their site (
https://www.fcsdchemicalsandlubricants.com/main/searchdiesel.asp) for Diesel Motor Oils Meeting
WSS-M2C171-F1 I get:
Brand Name Viscosity
711 SynShield™ OTR Plus SAE 10W-30 10W30
722 SynShield™ Ultra Performance SAE 10W-30 10W30
Advantage HD DEO Synthetic Blend 10W30
Advantage Ultra Premium Plus 10W-30 CK-4 10W30
Advantage Ultra Premium Plus 10W-30 CK-4 10W30
All Fleet T SAE 10W-30 10W30
All-Fleet Plus 10W30
All-Fleet Plus E900 10W30
Allied 10W30
Altra Fleet 10W-30 CK-4 10W30
Bestbuy Diesel 10W30
Big Red 10W30
Blue Mountain Professional 10W30
CAM2 SYNTHETIC BLEND SUPER HD 10W30
Capital Bulk 10W30
CARQUEST 10W30
Carquest Premium Diesel 10W30
Chemlube Premium Multi-Fleet 10W30 CK4 Engine Oil 10W30
CITGARD® 700 Synthetic Blend Engine Oil 10W30
D-MO SAE 10W-30 10W30
Doosan 10W30
Duragard 10W30
Duralect 10W30
Duralene Dura-Max SB 10W-30 CK-4 10W30
Duron SHP 10W-30 10W30
Dyna-Plex 21C SHPD 10W30
Eco Ultra Premium Diesel 10W30
EcoPower 10W30
ECOSE Horizon HD 10W30
ECOSE Horizon Synthetic Blend 10W30
Federal Maxxum LE Synthetic Blend 10W-30 CK-4 10W30
Five Point 10W30
Fleet Pro Elite Synthetic Blend 10W30
Fleetrite Synthetic Blend 10W30
FS Suprex 10W30
Gibraltar Super S-3 LX 10W-30 CK-4 10W30
Golden West 10W30
Gulf Super Duty Plus 10W30
Gulf Super Duty Plus SB 10W30
Harvest King 10W30
HyFilm LEO 10W-30 10W30
Hyperion Blend 10W30
IDO Premium Plus 10W30
Kendall SUPER-D XA® w/ Liquid Titanium® 10W-30 10W30
Kendall SUPER-D® EC 10W-30 10W30
Klondike 10W30
Klondike Synthetic Blend 10W30
Lube King 10W30
LubeForce 10W30
Lubriguard 10W30
Mag 1 10W30
Mag 1 Synthetic Blend 10W30
Mahindra 10W30
Maxtron DEO 10W30
MFA OIL 10W30
Mobil HDEO 10W30
Monarch Diesel Ultra Semi-Syn 10W-30 CK-4 10W30
Monarch Diesel Ultra Syn 10W-30 CK-4 10W30
Monolec® Ultra Engine Oil 10W30
Motorcraft Super Duty Diesel Motor Oil 10W30
Mystik® JT-8® Synthetic Blend Super Heavy Duty Engine Oil 10W30
Napa Value 10W30
Navi-Guard Extreme Synthetic Blend CK-4 10W-30 10W30
Navi-Guard Premium Fleet Plus CK-4 10W-30 10W30
Oilzum Special CK-4 10W-30 10W30
Parts Master 10W30
PEAK Heavy Duty 10W-30 10W30
PEAK Heavy Duty Synthetic Blend 10W-30 10W30
Performance Plus 10W30
Phillips 66 FLEET SUPREME EC® 10W-30 10W30
Phillips 66 GUARDOL ECT® w/Liquid Titanium® 10W-30 10W30
Pro Guard Premium 10W30
ProSpec V Synthetic Blend 10W-30 10W30
Purezone Premium Diesel 10W30
PURUS Synthetic Blend 10W-30 10W30
Reliant 10W-30 10W30
Rotella T4 Triple Protection 10W30
Royal Purple Duralec Super 10W-30 10W30
Sinclair 10W30
Sonic D-MO SAE 10W-30 10W30
Sunoco Super C Gold 10W-30 CK-4 10W30
SUPER S FG-2000 SYNTHETIC BLEND 10W30
Superline™ 10W-30 10W30
Superlube TMS 10W30
THRIVE HEAVY DUTY DIESEL CK-4 10W-30 10W30
Titan SAE 10W-30 10W30
TOTAL Rubia Optima 1100 FE 10W30
TOTAL Rubia Optima 1100 FE 10W30
Tune-It 10W30
Ultra Fleet HD Synthetic 10W-30 10W30
United Super Diesel 10W30
United Super Premium Fleet 10W30
Universal Dezol 10W30
Wakefield Diesel Engine Oil 10W-30 CK-4 10W30
Williams Titan 800 Synthetic Blend 10W-30 CK-4 10W30
Xtreme Fleet 10W30 CK-4 10W30
So they have a blanket statement that
NO 10W-30 meets their spec, but then give you this huge list of ones that are approved? I'd not want to own a brand new one of their pickups right now, I feel like there is no way to weave through this without "getting it wrong" somewhere.