W205 Oil Journey (7) - MB Approval + LSPI Prevention 5W-30 (Part 2)
Oil Selection and Comparison
Following up on the candidates from Part 1, I have temporarily excluded 0W oils for the following reasons:
- Shell 0W-40: Although it has better extreme low-temperature fluidity, its viscosity at 40°C is higher than 5W-30. In Taiwan’s climate, its startup protection is not as effective as 5W-30.
- Ravenol SSV: The production dates found in local Taiwan stock are often quite old, so it has been removed from the comparison.
The Comparison Lineup
- Shell Helix Ultra 5W-40
- Shell Helix Ultra X 5W-30
- Total Quartz Ineo MC3 5W-30
- Castrol Edge M 5W-30
All of these oils meet MB 229.5 and 229.52 approvals.
Based on approval standards, the wear protection requirements are identical. Therefore, it is only meaningful to compare parameters between oils that share the same certification.
Oil Parameter Comparison (2026 Updated)
| Property | Shell Helix Ultra 5W-40 | Shell Helix Ultra X 5W-30 | Total Ineo MC3 5W-30 | Castrol Edge M 5W-30 |
|---|---|---|---|---|
| Approval | 229.5 / LL01 / SP/SQ | 229.5 / LL01 / SP/SQ | 229.52 / LL04 / SP | 229.52 / LL04 / SP |
| Viscosity @ 40°C | 75.7 | 66.4 | 69 | 68 |
| Viscosity @ 100°C | 12.8 | 11.8 | 12 | 12 |
| HTHS | 3.5+ | 3.5+ | 3.5+ | 3.5+ |
| TBN | 10 | 10 | 6 | 6 |
| Pour Point (°C) | -45 | -48 | -36 | -39 |
| Flash Point (°C) | 242 (D92) | 245 (D92) | 230 (D92) | 232 (D92) |
| Base Oil | Group 3+ (CAS:848301-69-9) | Group 3+ (CAS:848301-69-9) | Group 3(2) (CAS:64742-54-7) | Group 3(2) (CAS:64742-54-7) |
Parameter Deep Dive
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Certifications As of 2026, Shell’s two oils have been the first to update to API SQ. Compared to the SP standard, SQ sets much stricter requirements for timing chain wear and LSPI protection. Total and Castrol versions currently on the market are generally updated to SP.
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Viscosity @ 40°C This affects startup lubrication. A lower value indicates higher fluidity, meaning components receive lubrication faster, thereby reducing startup wear.
- Viscosity @ 100°C Represents the oil’s thickness at engine operating temperature. For oils with the same approval, the wear protection standard is consistent.
- Healthy Engine → Lower viscosity is better for fuel economy.
- High Mileage (>120k km) → Higher viscosity helps maintain cylinder pressure.
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HTHS (High-Temp High-Shear Viscosity) Indicates the oil film’s resistance to shearing under stress—a key anti-wear metric. The standard is identical under MB 229.5/52.
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TBN (Total Base Number) Indicates the durability of the oil, affecting the drain interval.
According to Oil Finder recommendations, MB 229.5 oils can support a 25,000 km interval, while MB 229.51/52 oils are typically limited to 15,000 km. -
Pour Point The lowest temperature at which the oil remains fluid. Shell’s GTL base oil offers significantly better low-temperature fluidity (-45 to -48°C) than traditional VHVI oils.
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Flash Point The temperature at which oil vapors ignite. Higher is better for reducing oil consumption.
Because GTL base oils have more uniform molecular chains, their flash points can reach over 240°C, compared to roughly 230°C for VHVI, making them less prone to evaporation. - Base Oil The foundation of oil quality:
- Shell uses GTL (Gas-to-Liquid), categorized as Group 3+.
- Total/Castrol use VHVI (Very High Viscosity Index), which is technically still a Group 3 oil derived from hydrocracked mineral sources (Group 2 lineage).