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BMW White Smoke From the Exhaust: Causes and Costs
White exhaust smoke on a BMW with coolant loss, bubbles in the coolant tank or overheating is the head gasket pattern on our repair page, but on the X5 N62 white smoke is also commonly valve stem seals, so get a clear diagnosis before approving a full head gasket job.
Last updated · By BimmerQuote (how we build guides) · Costs on this page come from the linked repair pages, each citing its sources.
What the head gasket page describes
The head gasket page lists coolant loss with no visible leak, white exhaust smoke, bubbles in the coolant tank, overheating, and oil at the head or a broken aluminum head bolt on early E90 N52 cars. It covers the F30 328i (N20), the E90 325i and 330i (N52) and the E70 X5 (N62). Oil leaks are often mistaken for a head gasket, so confirm with a leak-down or combustion-gas test before approving the job.
Early E90 N52 cars used aluminum head bolts that can break and mimic a head-gasket leak, and several 325i and 330i owners in the source thread hit this around 50,000 to 60,000 miles. On X5 N62 engines, white smoke is also commonly valve stem seals, according to the page. Ask whether head machining, Timeserts and timing-chain parts are included in a quote, because scope is a big part of the spread. See Head Gasket Replacement.
Blue smoke is a different list
Blue smoke comes up on separate pages, and a rattle on cold start is in the BMW Cold Start Rattle, Whine and Squeal: Causes by Engine. On the N63 V8, blue smoke after idling or at startup with about a quart of oil burned every few hundred to 1,000 miles is the valve stem seal job, which the dealer in the source thread did with the engine out (N63 Valve Stem Seals). On the N20, blue smoke on cold start is sometimes only the updated oil feed line rather than a failed turbo (N20 / N26 Turbocharger Replacement).
Our head gasket page ties white smoke to coolant loss, bubbles in the coolant tank and overheating. On the X5 N62 it is also commonly valve stem seals, and early E90 N52 head bolts can mimic a head gasket leak.
How much does a BMW head gasket replacement cost?
Head Gasket Replacement on a BMW with the N20/N52/N62 engine typically costs $900–$2,500 at an independent shop or $4,500–$13,000 at a BMW dealer, based on 7 real owner-reported prices.
How do I confirm a head gasket problem?
The repair page says to confirm with a leak-down or combustion-gas test before approving the job, because oil leaks are often mistaken for a head gasket.
What does blue smoke mean on a BMW?
On the N63 it is tied to the valve stem seals, and on the N20 blue smoke on cold start is sometimes only the updated oil feed line.
Where this comes from
Every cost on this page is pulled from these repair pages, which list the price, the forum or shop source and the details for each report. This guide adds no prices of its own.
