1972 BMW 2002

Typical onset: 120,000-180,000 mi

Symptoms: Low oil pressure at idle when hot, Knocking or rumbling from crankcase, Metallic rattling on cold start that worsens, Oil pressure light flickering

Fix: Requires engine-out rebuild or short block replacement. Expect 20-30 hours labor for full teardown, machine work (crank polishing/turning), new bearings, gaskets, seals, timing components, and reassembly. Many shops recommend full refresh while it's apart (rings, valve job).

Estimated cost: $4,500-8,000

Typical onset: 100,000-150,000 mi

Symptoms: Blue smoke on deceleration or startup, Excessive oil consumption (quart per 500-800 miles), Loss of compression and power, Fouled spark plugs

Fix: Engine rebuild with bore honing or overbore, new pistons and rings. Labor overlaps with bearing job—smart owners do both simultaneously. Engine-out work: 25-35 hours including machine shop time.

Estimated cost: $3,500-6,500

Typical onset: 80,000-140,000 mi

Symptoms: Grinding into second gear, Difficulty downshifting into first when rolling, Crunching on cold shifts, Popping out of gear under load

Fix: Transmission rebuild with synchro replacement, bearings, and seals. Trans-out labor 8-12 hours; rebuild adds another 10-15 hours depending on damage extent. Worn shift forks and slider hubs often discovered during teardown.

Estimated cost: $2,200-4,000

Typical onset: 60,000-100,000 mi

Symptoms: Excessive shifter vibration, Clunking on throttle engagement/release, Drivetrain lurch during shifts, Visible engine movement from engine bay

Fix: Replace all three mounts (front, rear transmission, and transmission crossmember bushings). Straightforward job: 2-4 hours labor. Do all at once—they fail together.

Estimated cost: $400-750

Symptoms: Intermittent stalling or stumbling, Hard starting when hot, Fuel smell in cabin or trunk, Visible rust flakes in fuel filter, Fuel leaks near tank or hardlines

Fix: 50-year-old fuel systems need complete overhaul: tank cleaning or replacement, all rubber fuel hoses, mechanical pump rebuild or electric pump conversion, new filter and hardline inspection. Labor 6-10 hours depending on rust and line routing.

Estimated cost: $800-2,000

Symptoms: Rough idle, hunting RPM, Hesitation off idle, Black smoke and poor fuel economy, Difficulty cold-starting

Fix: Rebuild carb with new gaskets, jets, needles, and accelerator pump. Requires experienced tuner—improper jetting causes persistent driveability issues. 3-5 hours for rebuild and dyno-tune or road tuning.

Estimated cost: $500-1,200

Typical onset: 100,000-160,000 mi

Symptoms: Rattling from front of engine on startup, Rough idle and misfires, Vibration through steering wheel, Visible pulley wobble at idle

Fix: Replace timing chain, guides, tensioner, and crank pulley/damper. Front cover off: 8-12 hours labor. Neglect risks jumped timing and valve-to-piston contact.

Estimated cost: $1,500-2,800