![]() Wastegate rattle does not always mean that the turbochargers need to be replaced, in fact many owners have been able to adjust their turbo wastegates and get rid of the rattle. The turbochargers typically get replaced because of a faulty wastegate. A sign that your turbo is soon to fail is a wastegate rattle, and replacing the turbos is RIDICULOUSLY expensive. Twin-turbo failure on the early model E90s with the N54 engine is infamous. Luckily the Vanos solenoids are very easy to remove and clean out or replace, and if you need to replace them the parts are relatively inexpensive. They sometimes get clogged with oil sludge, and this can cause a severe impact on horsepower, lack of lowered torque, and a check engine light. Vanos solenoids control the flow of oil to the cam gears, allowing the timing to adjust. The Vanos itself is pretty reliable on the E90, but these vehicles utilize two Vanos solenoids. Symptoms are significantly less noticeable than the valve cover gasket but sometimes you will have 1) oil leaking on to the front of the engine, and/or 2) oil leaking down the driver’s side of the engine block. Oil filter housing gaskets are a little more difficult to replace but are still within the scope of a beginner. If there is smoke, it is caused by oil dripping onto the exhaust manifold and then burning off. Symptoms typically include 1) leaking oil on the side of the head, 2) potentially a burning oil smell, and 3) in worst-case scenarios you may have smoke coming from the engine bay. It was one of the first DIYs I did, and it can save you some money to do yourself. Valve cover gaskets are cheap and easy to replace. E36s, E46s, E90s, and F30s all commonly have these leaks. I’m not going to get into these two common issues too deeply because both of these leaks are not just common on E90s, they are extremely common on every 3 Series I have ever owned. Oil Leaks Valve cover gasket & oil filter housing gasket You can read my full E90 review here, this article will discuss the E90’s most common problems, symptoms, and repair costs. Although, this article will focus on common problems with the BMW E90 (and there are quite a few), I want to remind you early on that I consider these vehicles to be quite reliable overall. The handling is amazing, they have significantly more space than my old E36, and maintenance costs are reasonable. The E90 is one of my favorite vehicles I have ever owned. ![]()
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