Medium-Speed Trunk Piston Engine Oil Additive Package
CAS Number: N/A (formulated package)
Medium-speed trunk piston engine oil additive package for four-stroke trunk piston diesel engines used in marine auxiliary, power generation, locomotive, and stationary applications. Operates at 300-1000 rpm with combined crankcase + cylinder lubrication (no separate cylinder oil). Provides controlled TBN (typically 25-55 mgKOH/g in finished oil) to handle the moderate-sulfur HFO, MGO, and dual-fuel operation of these engines. Compatible with all major OEM specifications including MAN ES (medium-speed), Wärtsilä W series, MaK, and Caterpillar 3500 series.
Technical Specifications
| appearance | Brown viscous liquid |
| treat rate | ~6-9 wt% in finished SAE 40 oil |
| sulfated ash | ~1.5-2.5 wt% |
| flash point (COC) | ≥200 °C |
| recommended base oil | Group I bright stock blend, SAE 40 cut |
| kinematic viscosity (100°C) | ~120-160 mm²/s |
| total base number (TBN) in finished oil | 25 / 30 / 40 / 55 mgKOH/g (grade-dependent) |
Applications
- Marine four-stroke auxiliary diesel generators (MAN L+V series, Wärtsilä W20/W26/W32, MaK M20)
- Locomotive diesel engines (EMD 710, GE FDL, MTU 4000)
- Stationary diesel power generation (Caterpillar 3500/3600 series, Wärtsilä W32)
- Heavy fuel oil (HFO) burning trunk piston engines requiring moderate-TBN lubrication
- Dual-fuel (DF) medium-speed engines operating on diesel + natural gas
Key Features
- Multiple TBN tiers (25/30/40/55) match HFO sulfur content and engine operating profile
- Combined crankcase + cylinder duty — no separate cylinder oil required
- High-temperature detergency keeps piston ring zone clean in HFO service
- Long drain interval performance for stationary and locomotive applications (>2000 h)
Grade Variants & Supplier Reference
Specific grades available from leading Chinese-market suppliers. Spec sheets and lead-time vary per grade — request a quote to confirm availability.
Spec sheet not published — request TDS via inquiry form.
Richful general-purpose medium-speed pack — multi-TBN variants available, request TDS for specific BN.
View on supplier site →Big 4 Equivalents Cross-Reference
Approximate functional equivalents from leading global additive houses (Lubrizol, Infineum, Afton Chemical, Chevron Oronite). Chemistry tier, treat rate, and additive synergy may differ — always verify against the supplier TDS before formulation lock-in.
- L-1265 (medium-speed)
- L-1275 (HFO medium-speed)
- M-7195 (medium-speed)
- HiTEC 3140 (medium-speed)
- OLOA 31200 (medium-speed family)
Send Inquiry
CAS Number
N/A (formulated package)
Category
Automotive Lubricant AdditivesAvailability
In StockSample
Dispatched within 5 days