Complete Ceramic Protection for 3.0–4.8L Diesel Engines

Diesel engines require a higher treatment dose than gas engines because of their larger displacement, higher compression ratio, and heavier internal components. The bonding reaction needs enough SiC catalyst present in the oil to coat the entire ferrous surface area of cylinder walls, pistons, rings, main bearings, rod bearings, and cam lobes. For a 3.0–4.8L diesel, that works out to 4 oz of treatment — double the 2 oz dose used for smaller gas engines. This package ships two 2 oz bottles specifically to deliver that 4 oz total dose correctly. Don't split the dose across two oil changes — add the full 4 oz up front at the start of the protocol.

Match the viscosity specified in your owner's manual or printed on your oil fill cap — your manufacturer has engineered the engine around that spec. 15W-40 is the default diesel viscosity and fits the majority of 3.0–4.8L diesel applications (most GM Duramax, Ford Power Stroke 3.0L, Mercedes OM642, and marine/equipment applications). 10W-30 is called for by specific newer diesel engine families for improved cold-start protection and modest fuel-economy gain — notably some Jeep/Ram EcoDiesel, Mazda SkyActiv-D, and certain European diesels running low-SAPS emissions-compliant formulations. If your manual allows either, 15W-40 is the safer default in warm climates and 10W-30 in colder climates. When in doubt, call 239-344-9861 with your year/make/model/engine.

Yes — both the Cerma STM-3 Diesel Engine Treatment and Cermax Ceramic Synthetic Motor Oil are engineered for compatibility with all modern diesel emissions hardware: Diesel Particulate Filter (DPF), Diesel Oxidation Catalyst (DOC), Selective Catalytic Reduction (SCR), Exhaust Gas Recirculation (EGR), and Diesel Exhaust Fluid (DEF) systems. Cermax oil is formulated to meet API CK-4 performance specifications, which govern low-SAPS (Sulfated Ash, Phosphorus, Sulfur) content for emissions-equipment compatibility. No PTFE, no harmful solvents, no ash-producing chemistry that would clog a DPF or poison an SCR catalyst. Cerma products have been used in emissions-controlled diesels across the US, Canada, and Europe since the technology was first introduced.

No — not when you're running Cermax Ceramic Synthetic Motor Oil. Every diesel engine in the 3.0–4.8L range is turbocharged (this is why the category is also sometimes called "turbo diesel"). Cermax oil already carries SiC protection for non-ferrous turbocharger components — aluminum housings, bronze bushings, compressor wheels, and the specialized alloys used in modern variable-geometry turbos. The moment you switch to Cermax at the end of the 1,500-mile break-in, your turbo begins receiving non-ferrous ceramic protection from every subsequent oil change. This is why this package doesn't include a separate Turbo Nano Treatment the way our gas-engine racing packages do — the turbo protection is built into the oil.

Most 3.0–4.8L diesels take 6–8 quarts at oil change (for example: 3.0L EcoDiesel ~6 quarts, 3.0L Duramax ~7.5 quarts, Mercedes OM642 ~8 quarts). Use the Oil Quantity selector on the product page — you can order 5 through 10 quarts as part of this package with volume-discount pricing built in. Check your owner's manual for the exact factory oil capacity of your specific engine before ordering, and round up rather than down to ensure you have enough to complete the change.

Most modern 3.0–4.8L diesel vehicles ship with a torque-converter automatic transmission — ZF 8HP in the Jeep/Ram EcoDiesel, BMW 3.0 diesel, and Audi/VW 3.0 TDI (non-DSG); Aisin AS69RC in some Ram Cummins variants; Allison 1000-series in some GM applications; Mercedes 7G/9G-Tronic torque-converter units in Mercedes diesels. Select the Automatic Trans variant for any of these. Manual transmissions are rare in this class but do exist — some VW/Audi 3.0 TDI were offered with a 6-speed manual, and historic Jeep Liberty CRD variants used a manual. If you have a stick shift with a clutch pedal, select the Manual Trans variant. If you drive a VW/Audi 3.0 TDI with DSG (dual-clutch), do not select the Automatic Trans variant — DSG uses dual-clutch-specific fluid and our automatic treatment is not validated for it. Order the base Value Package instead and call 239-344-9861 for DSG-specific guidance.

Cerma is a wear-protection and friction-reduction technology — not a repair product. It will not fix a mechanical failure, worn piston rings, a stuck EGR valve, a failed turbo, a plugged DPF, or a failing injector. What it can do is slow the progression of wear-related issues. Many owners report reduced blow-by, improved compression uniformity across cylinders, smoother idle, and modestly better fuel economy after completing the full 1,500-mile bonding protocol — all side effects of reduced internal friction and a sealed ceramic wear surface. If your diesel is currently producing black smoke, burning oil at a rate above manufacturer spec, or throwing emissions codes, diagnose the underlying cause first. If the mechanical system is healthy but showing signs of age, Cerma can extend its service life significantly.

Standard premium diesel synthetics — Mobil 1 Turbo Diesel, Shell Rotella T6, Chevron Delo 600 ADF, and similar — use advanced additive packages (detergents, dispersants, anti-wear ZDDP chemistry) to manage wear and keep the engine clean. They're good oils. Cermax Ceramic Synthetic Diesel adds one more thing those oils don't have: a continuous feed of silicon carbide ceramic particles that reinforce the permanent SiC layer bonded into your engine during the Cerma treatment, and that also deposit a protective film on non-ferrous turbocharger components. This is why Cermax supports up to 30,000-mile oil change intervals on a treated engine — the SiC layer replaces friction-generated wear that would otherwise consume the oil's additive package over shorter intervals. For an untreated engine, Cermax still meets API CK-4 performance standards. For a Cerma-treated engine, Cermax unlocks the full benefit of the system.