BMW 728i (E38) review: the sensible way into a real 7 Series
3.8/5motorssouq Editorial Team
Buy a 1998-or-later 728i specifically for the Alusil block, check the self-levelling rear suspension for sag and the plastic cooling components for brittleness, and you get a genuinely comfortable, mechanically simple flagship for a fraction of what a 740i or 750i of the same age costs to insure and maintain. It is slow next to its V8 siblings and does not need to be anything else.
Pros
- Post-1998 Alusil block eliminates the earlier Nikasil bore-wear risk
- Cheapest, most mechanically simple entry into E38 ownership
- Straight-six is smooth and inexpensive to insure in Bahrain
- Independent specialists here know the platform thoroughly
Cons
- Self-levelling rear suspension sags with age and needs proactive repair
- Plastic cooling components turn brittle and crack after two decades of heat
- Noticeably slower than the V8-engined 740i and 750i
- Parts supply is thinning as the platform ages out of dealer support
BMW's E38 generation is widely regarded as the best-built 7 Series the company has made, and the 728i is its most overlooked variant. A 2.8-litre straight-six with 193 hp is modest next to the 740i's V8, but the six is smoother, cheaper to insure in Bahrain, and — from the 1998 facelift onward — free of the Nikasil cylinder-bore wear that plagued earlier M52 engines on higher-sulphur regional fuel.
What actually breaks
The self-levelling rear air suspension is the item most 728i buyers discover the hard way: the hydraulic pump and accumulator sphere wear out and the rear end sags, usually accompanied by a warning light. It is a known, serviceable fault rather than a reason to walk away, and independent BMW specialists in Bahrain handle it routinely.
The second item is entirely climate-driven: the plastic radiator end tanks and expansion tank become brittle after two decades of Gulf heat cycling and eventually crack, usually announcing themselves with a slow coolant loss. Replacing them proactively is cheap insurance against a roadside overheat.
Why it is the smart E38
Away from those two items, the 728i is mechanically simple by luxury-saloon standards — no VANOS-heavy V8, no adaptive air suspension complexity beyond the rear axle, and a five-speed automatic that BMW specialists in Bahrain can rebuild rather than replace. For a buyer who wants the E38's cabin, ride and badge without a V8's running costs, it is the obvious used-market pick.